Fix quoting error in generic_vhost.erb

This change fixes a regression introduced by change
I9a502bfa2ebced111fd3f990cafef188f39995f8 and adjusts the indentation.

Apparently there is currently only one use of this template in
manifests/misc/statistics.pp, and that does not utilize "ssl =>
'true'", so this change should not make any SSL webservers
unexpectedly appear from nowhere.

Change-Id: I550489752afa36e46e966ccfdc7ece9fded838db
Merge "Fix quoting error in generic_vhost.erb" into production