arc/cli/actions/job.py: Set test type and name when using --from-test-number

Use the name of the test, if no name is passed (missing option --name)
when using the option --from-test-number. Fix issue #4

Set test type (client/server) from the test number provided, when using
option --from-test-number. Fix issue #4

Signed-off-by: Ruda Moura <rmoura@redhat.com>
Merge pull request #10 from ruda/issue_4_alternative

Automagically insert test type and test name when using job --add --from-test-number