Add user_data_format

user_data_format must be set to SOFTWARE_CONFIG on instances of
OS::Nova::Server where there are deployments. Corrects the following
error:

ERROR: Resource BlockStorage0's property user_data_format should be set
to SOFTWARE_CONFIG since there are software deployments on it.

Change-Id: Iba29588374980098d71585ff1bf26ad914a6711c
Merge "Add user_data_format"