Always create the `signing_dir` basedir

Since the `signing_dir` is always set in api-paste.ini,
the basedir must exist or the openstack compute API fails
to start.  No reason to guard the creation of this dir
now that it is always referenced.

Change-Id: I4c62cba37b801aa5d07151e049e6ad30bf6a8a29
Use new cookbook name for service_password

Bring this cookbook in line with other cookbooks
(openstack-block-storage), already following this
pattern.

Change-Id: I34d40d102b94459d700fbd290fad684297e27e66
Merge "Use new cookbook name for service_password"
Tests should be using require_relative

The #require_relative statement is relative to the file
containing the the statement. Also, updated spec_helper
constants to follow existing spacing format.

Change-Id: I33c5c158ea34c30baf63bd72819b9d44b8516ca4