moved msg types to OSG.
added stubs for multipart.
added ACL annotations to multipart types.
added backend implementation for some MPU ops.
added listMultipartUploads.
fixes to bindings for mpu.
keymarker & other fields in upload response are optional.
POSTs that are not multipart/form-data are handled by the PUT pipeline.

Renamed old POST pipleline and stages to FormPOST.
added checks to initiate multipart
fix signing for upload part to only pick up the first substring left of =
Merge branch 'testing' of git.eucalyptus-systems.com:eucalyptus into team/storage/mpu
fixing case in msg type for walrus.
added contentType to uploadpart; correctly handle case sensitivity for params.
Merge branch 'testing' of git.eucalyptus-systems.com:eucalyptus into team/storage/mpu
fixes to upload part, correctly extract upload id.
Merge branch 'testing' of git.eucalyptus-systems.com:eucalyptus into team/storage/mpu
merge testing and partial fix for complete upload.
fixes to complete upload to get size.
number of fixes to upload part (return headers, get backend object key, update size on complete.
fixed to complete upload and binding fixes.