[Lib] Library for multi volume creation

Earlier, brick creation is carried out based on the difference of used 
and unused bricks. This is a bottleneck for implementing brick
multiplexing testcases. Moreover we can't create more than 10 volumes.
With this library, implementing a way to create bricks on top of the 
existing servers in a cyclic way to have equal number of bricks on each
brick partition on each server

Added paramter in setup_volume function, if multi_vol flag is set it
will fetch bricks using cyclic manner using (form_bricks_for_multi_vol)
otherwise it will fetch using old mechanism.

Added bulk_volume_creation function, to create multiple volumes the 
user has specified.

Change-Id: I2103ec6ce2be4e091e0a96b18220d5e3502284a0
Signed-off-by: Bala Konda Reddy M <bala12352@gmail.com>

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