Add account tests.
Fixed UID and GID parameters of user and group creation.
networking: fixed handling of options for address

Since Address subcommand does not allow for <caption> argument to repete
in its usage string, it should not treat received argument as a list --
docopt will pass it as single string.
Merge pull request #49 from jsafrane/devel/account-test2

Tests for account script v2
Commands for VGs and LVs should not work for thin versions.
Merge pull request #50 from boocz3ch/master

Commands for VGs and LVs should not work for thin versions.