Bugfix allow_override spacing in proxy template

The white space at the beginning of the line in the allow_override
setting can end up being associated with the swauth url on the
preceeding line.  Removing the extra and unnecesary white space
resolves the issue.

Change-Id: I1ccb731cfb7a7a39b7b5026be345a6d50202930c
Bugfix tempurl role restriction

The tempurl can be and should be enabled on all proxy servers.  When
restricted to just the management server, and requests are loadbalanced
among all proxy servers, the majority of tempurl requests will fail as
they will reach non-management servers.

Change-Id: Icae42a3c44c17251c3cebff3a9c4e05dc36990f7
Super_admin_key role restriction and attrib fixes

* Do not role restrict super_admin_key in proxy config.  At one
point it was thought this may increase security by having the
super key only available on the management server, but this
is incompatible with some addon pipeline items like tempurl.
* Correct swauth_version attribute in proxy recipe which was
referenced incorrectly as swauth-version, leading to no swauth
installation action taking place
* Treat platform_options["swauth_packages"] properly as a
list which is how it is defined in attributes
* Further discoveries of swauth-source vs swauth_source
discrepancies corrected
* Cleanup guard check for swauth packages

Change-Id: Ia0579a4518f45f7a6d5602c22351361424134d85