Support execution independent on issue-config file

[kkaarreell]

• remove the default option from --issue-config
• introduce jira --issue and --job-recipe options enabling to perform JiraJob even without --issue-config
• does some extra processing in RP launch merge as we may be working with just a single Jira issue per multiple artifacts

[kkaarreell]

FYI, you can use https://app.semanticdiff.com/gh/RedHatQE/newa/pull/67/changes to ease the diff review.