heat engine : add option to control instance boto http/https

Currently the heat-jeos code defaults to http only, but we are
about to fix that, so we instead need a way to specify if
instances should connect via http or https - boto provides the
is_secure config file option, so add a new heat option which
controls this setting in the boto config we create in userdata

fixes bug 1117594

Change-Id: I0b9201107570334d9846d9613d252da1a91efe8a
Signed-off-by: Steven Hardy <shardy@redhat.com>
Merge "heat engine : add option to control instance boto http/https"