Replaced gLogger by self.log, added messages

Change-Id: I70270e49a44f610ec1555983db560363f0a81a42
Add check that path is defined

Change-Id: I4ce7f0f68141e146723be3673d8f18b89cc24633
Add check that there are no failures

Change-Id: I6412e87e5066fedec5d2d8824c83fe4341255685
Add a which pip before execution

To make sure the pip used is the right one.

Change-Id: Ib6349c9549382676ac6f323988cd03d272d9edfd
tag v0r0p11

Change-Id: Ib28b7d1145b224fa6d892ff06812e840fbe8bf82