TST/CLN: centralize module check funcs
BUG: df.reset_index loses tz
BUG: offsets.apply may return datetime
Merge pull request #7533 from sinhrks/resetindex

BUG: df.reset_index loses tz
Merge pull request #7451 from sinhrks/skiptest

TST/CLN: centralize module check funcs
Merge pull request #7502 from sinhrks/offsetret

BUG: offsets.apply may return datetime
TST: dtype test fixes for GH7533
Merge remote-tracking branch 'upstream/master'