Reading and adjusting SuSEfirewall2 configuration moved from inst_finish to inst_proposal

- This has been done because AutoYast profile can be already exported
  1. in inst_proposal
  2. in inst_finish before reading (and writing) the configuration
- Tested in inst-sys
Changes and version
Removed import which is not needed (anymore)
Merge pull request #228 from kobliha/clone-autoyast-profile-first-stage

Fixed cloning the Firewall settings
Fixed network_autoconfiguration_test stubbing on s390 (bnc#883836).

This particular test does not want to test s390 specialties so make it
see a boring machine.
Merge pull request #229 from mvidner/default-route

Fixed network_autoconfiguration_test stubbing on s390 (bnc#883836).
properly convert proxy config from install.inf (bnc#885957)

- 3.1.80
small fixes in tests
Merge pull request #230 from yast/proxy_config_from_install.inf

properly convert proxy config from install.inf (bnc#885957)
Updated testsuite for ReadHardware and bnc#841170
Initial cleanup in ReadHardware
Straightening ReadHardware workflow
Adapted testsuite
Filter out storage only devices. bnc#841170, fate#316090

Broadcom multifunctional devices use private flags which can be used for
distinguishing device capabilities.
Removed dead code / comments
Continuing cleanup
Refactoring: Splitting ReadHardware
Refactoring: ReadHardware - replaced some of internal variables

to ease further splitting into separate method
ReadHardware: cleanup - replaced a Builtins' method using ruby native
ReadHardware: splitted more code filtering detected devices