Bug 997633 - Update Python marionette_client to 0.7.6
Bug 997673 - Small refactor of Python cost control app tests
Merge pull request #18411 from zacc/bug_997633

Bug 997633 - Update Python marionette_client to 0.7.6
Merge pull request #17073 from zacc/bug_979914

Bug 997673 - Refactor of cost control python tests
Bug 993832 - wrong multi-res resource file name