Enable debug logging in q-agt output

when only q-agt is used, without q-svc, typically in a multi-host config, q-agt wasn't logging debug output.
This change enable debug output, as it's done for q-l3, q-dhcp or q-meta agent.

Change-Id: I1f49cf9994fa9cfbaa166dac8d4e713ba99c5674
Fixes: bug #1166775
Fixes running horizon on fedora 18 and above

Fixes bug: 1167066
Summary:

1. Starting with fedora 18 the httpd.conf has
    <Directory />
        AllowOverride none
        Require all denied
    </Directory>
  which requires you to explicitly permit access to web content
  directories in other <Directory> blocks

2. Install nodejs on fedora 18 and above

Change-Id: I487a7a74bad6627d32c1081dcbe48630a704a106
Parameterized configuration variables for PLUMgrid plugin

Fixes bug 1171028

Change-Id: Ie60ef8903001913996e265917c449bdce1e5aae9
Merge "Fixes running horizon on fedora 18 and above"
Merge "Enable debug logging in q-agt output"
Merge "Parameterized configuration variables for PLUMgrid plugin"