ansible: gsm-tester: Enable ip forwarding and masquerading on boot

Some nodes in the internal network, such as LimeNetMicro, will need
Internet access to upgrade osmo-trx-lms from OBS repos.
It also makes it easier to update manually other nodes inside the
internal network.

Change-Id: I2c89cf9cfcb55b3153e7be212c68ffa8db0f6927
5 files changed