Merge changes...

Merge changes If78ff744,I5c059cc6,Ie7fba967,Iac1bcbea,Id1409ec4,Ibcee26e6,I348e5270,Iddd154cd,I4c5b3ba0

* changes:
  Refactor testutils folder structure.
  Refactor lint folder structure.
  Fix eclipse projects from previous refactoring.
  Refactor manifestmerger folder structure.
  Refactor ddmlib folder structure.
  Refactor sdklib folder structure.
  Refactor dvlib folder structure.
  refactor layoutlib_api folder structure.
  Refactor common lib folder structure.