Moved the configuration variables.

Moved the configuration variables from dhcp agent
to linux interface so l3-agent works with
Metadriver.

Also removed the unnecessary configuration variables
from quantum debug agent because of the above
modification.

Fixes: bug #1138757

Change-Id: Ib23fee18a08ef1c531feb05d98c9a76f5385a4ff
Merge "Moved the configuration variables."