Fixed typo error OS_IMAGE_URL

OS_IMAGE_URL is not coorect, replaced it with HEAT_URL and did
according changes.

Change-Id: I0c06dfe6c013a358a46eab2ce4e9b7a44d98672d
Wrapped some long lines

Some lines has been wrapped some not. So wrapped the left long lines.

Change-Id: I67b40e580b53cb7dca40112b3a3c112c359893dd