Upgrade from PHPunit 3.7.x to PHPUnit 4.8.x

Upgrade from PHPunit 3.7.x to PHPUnit 4.8.x

Major changes:

* (4.0.0) Limited support for stubbing and mocking static methods was removed.
          (introduced in PHPUnit 3.5)
* (4.0.0) The addRiskyTest() was added to the PHPUnit_Framework_TestListener interface.
          Classes that implement this interface MUST implement this method.
* (4.5.0) The "--strict" catch-all option was deprecated. Use specific options instead.

Notable changes:

* (4.6.0) Tests not annotated with @small, @medium, or @large are no longer default
          to matching in group @small.
* (4.6.0) Result printer now checks hasColorSupport().
* (4.8.0) The name of the default group was changed from "__nogroup__" to "default".
* (4.8.0) This is the last release to support PHP 5.3, PHP 5.4, and PHP 5.5.
          PHPUnit 5 will require PHP 5.6 or higher.

PHPUnit 3.7.17 was released March 2013.
PHPUnit 4.8.0 was released August 2015.
PHPUnit 4.8.23 was released January 2016.

Details:

* https://github.com/sebastianbergmann/phpunit/wiki/ChangeLog-for-PHPUnit-3.7
* https://github.com/sebastianbergmann/phpunit/wiki/Release-Announcement-for-PHPUnit-4.0.0
* https://github.com/sebastianbergmann/phpunit/wiki/Release-Announcement-for-PHPUnit-4.1.0
* https://github.com/sebastianbergmann/phpunit/wiki/Release-Announcement-for-PHPUnit-4.2.0
* https://github.com/sebastianbergmann/phpunit/wiki/Release-Announcement-for-PHPUnit-4.3.0
* https://github.com/sebastianbergmann/phpunit/wiki/Release-Announcement-for-PHPUnit-4.4.0
* https://github.com/sebastianbergmann/phpunit/wiki/Release-Announcement-for-PHPUnit-4.5.0
* https://github.com/sebastianbergmann/phpunit/wiki/Release-Announcement-for-PHPUnit-4.6.0
* https://github.com/sebastianbergmann/phpunit/wiki/Release-Announcement-for-PHPUnit-4.7.0
* https://github.com/sebastianbergmann/phpunit/wiki/Release-Announcement-for-PHPUnit-4.8.0

Bug: T99982
Change-Id: I70ad81513812aa76a84fa55be14135aac94d55e8