HA mysql: parameterization, account security

Add HA-mysql-related parameters to the node manifest.
Add the account_security manifest to remove unused mysql accounts.
Add proxy for horizon with cookie support

This patch adds a proxy for load-balancing horizon. Persistence is
done with a SERVERID cookie. This patch also extends the proxy defined
resource to accept more options (addr, mode, listen_options,
member_options, and define_cookies).
Remove proxy for swift

Since we're not currently deploying swift via quickstack, comment out
the code the creates a load-balancer proxy for swift.
Merge pull request #28 from rohara/master

Add proxy for horizon with cookie support
Merge pull request #26 from cwolferh/hamysql_pro4

HA mysql: parameterization, account security
BUGFIX: Fix installer for foreman 1.3