Define root_helper variable under the [AGENT] section

Fixes bug 1105523

The patch set adds 2 new functions:
1. register_root_helper - this enables all wanting to use
the root_helper variable. This is under the section AGENT.
2. get_root_helper - this is a helper function that returns the
root_helper. This should be used when the application used to
have the root_helper defined under the section DEFAULT. This
ensures backward compatability.

Change-Id: Iba72c4fc89ba5329ea045483287012f82b306250
Imported Translations from Transifex

Change-Id: I0ebe0d71a5891c8bb53833ddc0ba7a9deca0c175
Be smarter when figuring out broadcast address

In most cases, broadcast is set when IP is set, but sometimes
it can be ommitted. In those cases we should figure it out based
on CIDR, and not assume it.

Change-Id: Ia8c07898ddf0eb19f5d552a304d8f38915fc3560
Fixes: bug #1090621
Merge "Imported Translations from Transifex"
Merge "Be smarter when figuring out broadcast address"