MT#6551 Cleanup Build script

- remove action test_tap
- only start server on "--run-server"
- make "--webdriver" optional
- remove Sipwise::Base from configure-requirements
MT#6551 Getopt allow unknown options

to pass through to Module::Build, for example "--verbose"
MT#6551 Add empty MANIFEST file

so perl Build.PL does not complain about that
and skip everything in MANIFEST.SKIP