heat api : allow validation of YAML templates via cfn api

Currently validation only works if the template is json

fixes bug 1131290

Change-Id: Ia08ba7cc18908697b5fdfc1eb711d84d7b39c7cb
Fix tarball tag to be empty rather than a point

Fix tarball tag to be empty rather than a point.
Really fixes bug 1131622.

Change-Id: Idfbd3eb7f5e0fb855e3153ac465896652eb74343
heat loadbalancer : make LB nested template create credentials

Create User/AccessKey resources correctly in the LB nested template
so we can create a cfn-credentials file which will allow cfn-hup
to access the CFN API

fixes bug 1131663

Change-Id: I11b6640dbc5689de8f6103f4c1e841f42acbba54
Merge "heat api : allow validation of YAML templates via cfn api"
Merge "heat loadbalancer : make LB nested template create credentials"
Get rid of unused imports

Change-Id: I954cf6eb2c326bbeb6bd043b2c11dfe2e01f52d3
Signed-off-by: Zane Bitter <zbitter@redhat.com>
Merge "Fix tarball tag to be empty rather than a point"