Port EucaRsaV2Auth to requestbuilder

This commit also updates euca-check-bucket to make it use the NC's auth
mechanism again.

Fixes TOOLS-269
Fix tag argument splitting for AS groups
autoscaling_tag_def:  Raise ArgumentTypeErrors instead of ValueErrors

Raising ValueErrors for bad input instead of ArgumentTypeErrors was
causing argparse to mask relevant error messages.

Fixes TOOLS-318
Merge remote-tracking branch 'mspaulding06/autoscaling_tag_def' into requestbuilder
TOOLS-308 Add euscale-create-or-update-tags
Fix auto-scaling tag help strings
More ellipses!
TOOLS-317 Fix euca-bundle-instance not working

* Fixed naming typo
* Updated to use params
Move import local import for consistency with other modules