Description of problem:
When you try to build ovirt-engine on a system using a language and/or country different from English and US (e.g French and Cameroon), the build of the module Branding package fails because during test phase, Maven Surefire uses OS Locale as default for getting some properties in MessageBundles, instead of en_US. 


Version-Release number of selected component (if applicable):
4.5.2

How reproducible:
Always

Steps to Reproduce:
1. Set the OS language and country to something other than English and US.
2. Follow Github documentation to deploy a development environment.
3. Launch the build of ovirt-engine.

Actual results:
The build fail with a message similar to this:

[ERROR] Failures: 
[ERROR]   BrandingThemeTest.testGetMessagesBundle:55 expected: <Login header> but was: <Login header(fr)>
[INFO] 
[ERROR] Tests run: 30, Failures: 1, Errors: 0, Skipped: 0



Expected results:
The build should consider the locale en_US as default and compile sucessfully.


Additional info:
Using JVM environment variables -Duser.country and -Duser.language doesn't solve the problem, however adding them in the argline element of the configuration section of Maven Surefire Plugin in the POM of ovirt-engine solves the problem.