CBQE-0: fix for hostname setup for linux

Change-Id: I2d556f889699412c8aaa36a88ab963dae46dc8cc
Reviewed-on: http://review.couchbase.org/27345
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>
CBQE-1338 Allow install.py to install couchbase on MAC

Change-Id: I259f490e0a57733a07bafad23bee99a5d01ef32f
Reviewed-on: http://review.couchbase.org/27270
Reviewed-by: Chisheng Hong <chisheng@couchbase.com>
Tested-by: Chisheng Hong <chisheng@couchbase.com>
CBQE-1335 delete all existing dbs for '--purge'

Old cbmonitor has "fast", "slow" db but new one creates dbs based
on cluster topology. So db name for deletion should not be hardcoded

Change-Id: I0cebcd15a55fffa4fc263b5ae4c43a46e0046c31
Reviewed-on: http://review.couchbase.org/27371
Reviewed-by: Chisheng Hong <chisheng@couchbase.com>
Tested-by: Chisheng Hong <chisheng@couchbase.com>
Remove redundant tests, edit existing P0,P1 jobs on conf files.

Change-Id: If84d353af4e4f2e4e22bcb53f9ed555b48e7dbf3
Reviewed-on: http://review.couchbase.org/27052
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>
Tested-by: Ketaki Gangal <ketakigangal@gmail.com>