[BUILD] Close stale PRs

Closes #15736
Closes #16309
Closes #16485
Closes #16502
Closes #16196
Closes #16498
Closes #12380
Closes #16764

Closes #14394
Closes #14204
Closes #14027
Closes #13690
Closes #16279

Author: Sean Owen <sowen@cloudera.com>

Closes #16778 from srowen/CloseStalePRs.