heat clients : Make boto client select http/https from configfile

Currently we hardcode is_secure=False, but boto supports configuration
of this option from the config file (either ~/.boto or /etc/boto.cfg)
so better to do that

NOTE - you will need to update your boto config to include is_secure=0
to retain current (non https) behavior, since it defaults to on

ref bug 1117594

Change-Id: Ic13e8604f12d3d5be4ec132a1bc04ae7624ec85d
Signed-off-by: Steven Hardy <shardy@redhat.com>
Merge "heat clients : Make boto client select http/https from configfile"