Moved parameters out to rubydev class into rubydev::params class

Created rubydev::params class with default values and included it in
the main rubydev class.  Overrides can now be set via Hiera. ;)
Added ability to specify db channel when registering to Spacewalk

. Added is_db_server parameter to lark_spacewalk and
lark_spacewalk::params
. Cleaned up parameter indenting in lark_spacewalk
. Added is_db_server to lark_spacewalk::setup, as well as hooks to
setup the pgsql92 repo if it’s set to ‘yes’ in either localdev or
Spacewalk environments.
. Removed extraneous “stage” statement in file stanza in
lark_spacewalk::setup, as it was illegal
. There may need to be some reorganizing of the orderings a little in
lark_spacewalk::setup