Bosh CLI added support to load plugins from local directories

Change-Id: Idf42ddda3249692928ac03576ef21afe11acaf3a
initial commit of aws bootstrap plugin

Change-Id: I68722b5a8d40afeb07e3a0e33b06e7d59aac4f5e
Merge changes I68722b5a,Idf42ddda

* changes:
  initial commit of aws bootstrap plugin
  Bosh CLI added support to load plugins from local directories