[php] support guzzlehttp/guzzle ^7.0

[oprudkyi]

PR checklist

• [ x] Read the contribution guidelines.
• [ x] Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
• [ x] Filed the PR against the correct branch: 3.0.0 branch for changes related to OpenAPI spec 3.0. Default: master.
• [ x] Copied the technical committee to review the pull request if your PR is targeting a particular programming language.

@dkarlovi (2017/07) @mandrean (2017/08)

Description of the PR

php sample regenerated based on swagger-api/swagger-codegen-generators#1040

• ported b99fea7
• updated https://github.com/swagger-api/swagger-codegen-generators/blob/master/src/main/resources/handlebars/php/composer.mustache

[oprudkyi]

@frantuma @HugoMario Could you please help to merge this ?

[andythedandy]

I would tottaly merge this!

[sharovik]

Should we release this one?

[sharovik]

Hey @frantuma, do you have the rights to merge and build this one?

[sharovik]

Actually, I see the code in this PR is not a mustache change. So it wont work

[sharovik]

You need to change the mustache code, instead you changed the sample

[oprudkyi]

@sharovik mustache code was changed in swagger-api/swagger-codegen-generators#1040

[sharovik]

Oh. I see. :(

[riccafi]

Are there some progresses about this pull request?
It would be fantastic to have this update!

Thank you all :-)

[Axent96]

@riccafi @andythedandy @oprudkyi some plans to merge the issue?

[sharovik]

I believe this may be helpful for everyone here.
So, take the mustache files from this PR https://github.com/swagger-api/swagger-codegen-generators/pull/1040/files
And when you build your SDK, use the next arguments: --template-dir="${MUSTACHE_TEMPLATE_PATH}" --template-engine="mustache"

Where MUSTACHE_TEMPLATE_PATH is the path, where you placed these files.

So you will have something like this:

swagger-codegen generate --template-dir="MUSTACHE_TEMPLATE_PATH" --template-engine="mustache" -i "path/to/your/api-docs.json" -l php -o "OUTPUT_PATH" -c "SWAGGER_CONFIG_PATH" 

[Axent96]

We need the fix ASAP or we can drop php support from the generator. guzzlehttp/guzzle v6 is deprecated a long time

[HugoMario]

addressed by swagger-api/swagger-codegen-generators#1040

[katsew]

Hi. I drop in here from #11123.
Any update?
My generated code generated by the latest docker container still using guzzle 6.2 in composer.json.