skyped: use argparse instead of getopt for CLI

Python 2.7 allows for much simplier ways to handle CLI, which is argparse.

Note that it's 2.7-only thing (otherwise there's a sligtly weaker optparse version), but as I see python2.7 in shebang, I assume skyped is python2.7-only.
If not, I can fix the shebang and use optparse (basically the same code, just different module).

Side note: reason to support 3-year-obsolete versions of python (that I'm able to spot) might be the fact that it's still used by "enterprise" distros like debian (squeeze) and rhel/centos as default.