New API for get/setting the local forwarder
Using new API for managing local forwarder in UI
Adapted testsuites
Added new RSpec test

- Changed the new API to be testable (Set* returns boolean)
- Used in test and also in dialog while storing values
Tuning RSpec test
Changes file entry a new version
Adapted gitignore
Cheating netconfig by using local 'bind' as resolver temporarily

- This is caused by documented netconfig behavior while FATE#309036
  requests some manual changes that might put the system into
  inconsistency and thus make netconfig skip updating the system
  configuration files
- This change uses approach acceptabe to netconfig - temporarily
  switching to state when files are updates by that tool and then
  switching back to original user-defined resolver
- Both forwarders.conf and the system are then updated to the latest
  greatest settings
Adapted testsuite to the latest changes

- Cheating netconfig
Adapted gitignore to newly generated log files
Incorporated comments from reviews

- Credits to @jreidinger
Disabling/enabling the local forwarder in UI according to current policy

- If policy is "don't merge" then it's disabled
- Otherwise enabled
Merge pull request #27 from kobliha/netconfig_forwarding

Added possibility to set local forwarder other than 'bind'