Apply patch for submodules when patch needed
For some web apps, we just submodule from external repo,
and our changes sometimes hard to be merged on time, so patch is needed.

Patch file name rule:
  1. Needed patch files should be located under [WebApp] folder
  2. Patch name should be ordered by alphabetical. (eg. 0000.xxx.patch 0001.xxx.patch)

Apply patch scenario:
  1. Check whether it's a git submodule, otherwise, skip below scenario
  2. Get sorted patch file list (Patches need to be orderly patched)
  3. Check whether patch files under WebApp folder, if none, skip below scenario
  4. Checkout the submodule to 'master' branch
  5. Remove 'auto_patch' branch which was created during previous build
  6. Create a new 'auto_patch' branch
  7. Apply all the patches
  8. Checkout to 'master' branch
'auto_patch' branch will be remained after build for further review.

BUG=#16