Fix handling of meta command within local working directory

* Fix osc ignoring -A apiurl command option when arguments are
  less than 2 and executed within local working copy

* Enhance handling of meta command within local working copy.
  - meta prj: Try to use project and apiurl of local working copy
    if no arguments are passed
  - meta pkg: Try to use project and apiurl of local working copy
    if one argument is passed (single argument assumed to be package
    name), and try to use project, package and apiurl if no
    arguments are passed