test: fix permissions for test/functional/test.sh

[luyangkenneth]

What is the purpose of this pull request? (put "X" next to an item, remove the rest)

• [X] Bug fix

What is the rationale for this request?
The following error shows up when doing npm run test on master. This points to a lack of execution permissions on the local machine (I use a mac).

Upon investigation, it seems that the permissions were modified in #588 (see screenshot below for relevant section of the diff) when moving the then test.sh to a different directory and creating a new test.sh.

What changes did you make?

1. chmod +x test/functional/test.sh (All our executable files are currently set to 755, except for this one.)
2. Removed the before_install config in .travis.yml because we shouldn't need it anymore

Testing instructions:

1. npm run test locally
2. Tests pass on travis