[stable10] drop php 7.0 and add phpunit7 [DO NOT MERGE YET]

[phil-davis]

Description

Combination of
#35786 "drop PHP 7.0"
#34921 Bump phpunit7 (backport)
Extra commit: "Update method signatures for EncryptionTrait markTestSkipped and assertTrue" to fix a problem reported in the encryption unit test code (which is not in master), to fix:

PHP Fatal error:  Declaration of Test\Traits\EncryptionTrait::markTestSkipped(string $message = '') must be compatible with PHPUnit\Framework\Assert::markTestSkipped(string $message = ''): void in /home/phil/git/owncloud/core/apps/dav/tests/unit/Connector/Sabre/RequestTest/EncryptionUploadTest.php on line 36
PHP Fatal error:  Declaration of Test\Traits\EncryptionTrait::assertTrue($condition, $message = '') must be compatible with PHPUnit\Framework\Assert::assertTrue($condition, string $message = ''): void in /home/phil/git/owncloud/core/apps/dav/tests/unit/Connector/Sabre/RequestTest/EncryptionUploadTest.php on line 36

Related Issue

Motivation and Context

See if it passes all together.

How Has This Been Tested?

CI

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

[codecov]

Codecov Report

Merging #35804 into stable10 will decrease coverage by 0.36%.
The diff coverage is 70%.

@@              Coverage Diff               @@
##             stable10   #35804      +/-   ##
==============================================
- Coverage       65.09%   64.73%   -0.37%     
+ Complexity      20239    19471     -768     
==============================================
  Files            1300     1297       -3     
  Lines           77238    76869     -369     
  Branches         1301     1301              
==============================================
- Hits            50279    49760     -519     
- Misses          26574    26724     +150     
  Partials          385      385

Flag	Coverage Δ	Complexity Δ
#javascript	53.85% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.88% <70%> (-0.4%)	19471 <11> (-768)

Impacted Files	Coverage Δ	Complexity Δ
lib/private/DB/ConnectionFactory.php	89.85% <ø> (+6.96%)	20 <0> (-1)	⬇️
index.php	0% <0%> (ø)	0 <0> (ø)	⬇️
console.php	0% <0%> (ø)	0 <0> (ø)	⬇️
lib/private/DB/MySqlTools.php	88.46% <82.35%> (+88.46%)	11 <11> (+7)	⬆️
...aring/appinfo/Migrations/Version20190410160725.php	75% <0%> (-25%)	4% <0%> (+2%)
core/Application.php	25.47% <0%> (-13.76%)	1% <0%> (-24%)
apps/files/lib/AppInfo/Application.php	30.55% <0%> (-9.93%)	1% <0%> (-6%)
settings/Application.php	51.44% <0%> (-8.75%)	2% <0%> (-39%)
...e/AppFramework/DependencyInjection/DIContainer.php	64.84% <0%> (-8.05%)	15% <0%> (-66%)
apps/files_trashbin/lib/AppInfo/Application.php	68.42% <0%> (-4.31%)	2% <0%> (-3%)
... and 197 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #35804 into stable10 will decrease coverage by 0.38%.
The diff coverage is 70%.

@@              Coverage Diff               @@
##             stable10   #35804      +/-   ##
==============================================
- Coverage        65.1%   64.71%   -0.39%     
+ Complexity      20197    19412     -785     
==============================================
  Files            1302     1298       -4     
  Lines           77158    76725     -433     
  Branches         1301     1301              
==============================================
- Hits            50232    49655     -577     
- Misses          26541    26685     +144     
  Partials          385      385

Flag	Coverage Δ	Complexity Δ
#javascript	53.85% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.87% <70%> (-0.42%)	19412 <11> (-785)

Impacted Files	Coverage Δ	Complexity Δ
lib/private/DB/ConnectionFactory.php	89.85% <ø> (+6.96%)	20 <0> (-1)	⬇️
index.php	0% <0%> (ø)	0 <0> (ø)	⬇️
console.php	0% <0%> (ø)	0 <0> (ø)	⬇️
lib/private/DB/MySqlTools.php	88.46% <82.35%> (+88.46%)	11 <11> (+7)	⬆️
...aring/appinfo/Migrations/Version20190410160725.php	75% <0%> (-25%)	4% <0%> (+2%)
core/Application.php	25.47% <0%> (-13.76%)	1% <0%> (-24%)
apps/files/lib/AppInfo/Application.php	30.55% <0%> (-9.93%)	1% <0%> (-6%)
settings/Application.php	51.44% <0%> (-8.75%)	2% <0%> (-39%)
...e/AppFramework/DependencyInjection/DIContainer.php	64.84% <0%> (-8.05%)	15% <0%> (-66%)
lib/private/Http/Client/Client.php	82% <0%> (-4.67%)	17% <0%> (-3%)
... and 205 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c688803...0827e08. Read the comment docs.

[phil-davis]

@DeepDiver1975 this works on top of "drop PHP 7.0" PR #35786
So as soon as we can drop PHP 7.0, it will be easy to also implement PHPunit 7 in stable10 with this code.
The master PR for PHPunit 7 is #34921 . So both can easily be merged at the same time when we are ready.

I suggest just give "comment" reviews. Do not click "Approve" yet. That will prevent any accidental merge of this PR.

[phil-davis]

See PR #35962 for the updated version of this after the stable10 -> master branch changes.