Fix Hostname/EnvMonitor.  Add call of UpdateAndPublishHostName to installAgentServiceScriptFiles.  Remove loops containing GetInterfaceName() which now returns a single string identifying the first active non-LO interface.

installAgentServiceScriptFiles()
UpdateAndPublishHostName()
Merge branch '2.0' of https://github.com/WindowsAzure/WALinuxAgent into 2.0