[rfpkg/el7] (12 commits) ...minor changes

Summary of changes: b17af39... Patch F30 to use python3 (*) 0950819... Add requires and Buildrequires python3-future (*) 435b206... Fix python2 shebang in python3 build (*) 7d80e7e... Fix --dist/--release option for 'master' %dist detection (*) e04bd8f... Rebuild for python-3.8 (*) 9ef1bde... Tweak %%if for el8 (*) 9b55968... minor improvements (*) 13765a7... Update to 1.26.0 Sync with fedpkg 1.37 (*) d49e225... Fix sources (*) 773012e... Bug fix (rfpkg new-sources) (*) 1a39ceb... New version with more fixes on multilib builds and python2 (*) 9138171... minor changes (*) (*) This commit already existed in another branch; no separate mail sent