NetworkService: changed API to support more backends (namely wicked)

The change is backward incompatible
Updated changelog
Base structure of hook module
Add result from the executed file
Add new methods, tests and test files
Partial corrections from review
Code review improvements
Add hooks path and loggind
Add module description and search path class
Fix type mismatch
Add missing method
More logging
Fix typo
PKGMGR_ACTION_AT_EXIT: change the default action to "summary"

- added combobox for changing the value
- see http://lists.opensuse.org/opensuse-factory/2013-11/msg00667.html
  for more details
- 3.1.4
Merge pull request #151 from yast/summary_dialog

PKGMGR_ACTION_AT_EXIT: change the default action to "summary"
Rename Hooks module to DebugHooks due to conflict with new hook feature
use "/usr/bin/rspec" instead of "/usr/bin/env rspec"

fixes infinite loop in 12.3 build
removed support for automatic 2nd stage

- the 2nd stage has been dropped completely (FATE#314695)
- 3.1.4
Merge pull request #150 from yast/no_automatic_2nd_stage

removed support for automatic 2nd stage
Add pattern into the description at the top