For deploy:cleanup, use try_sudo with rm command.
Fixes parallel execution command logging, GH-434

branches when more than one is really an array of array and hence
must be treated as such.
Restore maintenance.rhtml

from 28c484f1f5e6a009d1b8ff07d85e924d6f947d3c^
Merge pull request #454 from joshstaiger/sudo_cleanup

For deploy:cleanup, use try_sudo with rm command.
Merge pull request #456 from chulkilee/fix-maintenance

Restore maintenance.rhtml
Merge pull request #455 from gnufied/master

Fixes GH-434, If branches is an array of array, iterate them separately.
Preparing Release v2.15.3