Allow user to specify stack name on stack create
this allow Storperf to run multiple time at same time
using same OpenStack
Adds stack_name to all /configurations API requests as
an optional parameter.
Adds stack_name to the /jobs API POST as an optional
parameter.
Adds stack_name to the /initializations API as an
optional parameter.
Adds all stack info to the metadata for later reporting.
JIRA: STORPERF-256
Change-Id: Ief69c69472e08ee821555f3a006ab9edc7ec177f
Signed-off-by: Ameed Ashour <Ameed.Ashour.ext@nokia.com>