add emacs shell-script tagging

for files that don't start with a #! or end in .sh, the added tags
are nice for emacs users to automatically switch to the right mode.

Change-Id: If4b93e106191bc744ccad8420cef20e751cdf902
Make Swift *_PORT_BASE configurable

DevStack's Swift port defaults changed in the Grizzly cycle, we need to
put it back to complete the upgrade without going through the ring build process.

Change-Id: I30c09839690ad7ba9bb3fdffa3f05aedfc47559e
Merge "Make Swift *_PORT_BASE configurable"