Remove old qt libs if the qt installation folder is different.

Store and check the Qt instalattion folder.

Change-Id: I7a890da82d5b7a4ae467d157daa7c4e41b15a11b
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Print adb commands in verbose mode.

Change-Id: I3b779f82ef5b4b474eda9e6f2911a7bf46b8c87d
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: I5722759d15676448eb976bfbd908d9cd5eb2650f
Merge "Merge remote-tracking branch 'origin/stable' into dev" into refs/staging/dev