fixing base64 encoding for policy sig calculation
Propagate user facing service backend failures to client - EUCA-9168

Messages with a _return of false were treated as errors but these should
be returned to the client when the response is of the expected type for
the action.

EUCA-9168
Fix element naming in EC2 error responses - EUCA-9176

EUCA-9176
allowing upload policy either in JSON or base64
Merge remote-tracking branch 'origin/dev/sjones/EUCA-9176' into testing
Fixed ACL check and mangling in setlAcl to no unset the policy owner if already set. Fixes EUCA-9166
increasing timeout for download manifest download to 2.5+ hrs
EUCA-9175: Check manifest's owner before registering an image
Fixes 403 on POST due to failed context lookup.
embedded upload ACLs into workflows
EUCA-9172: keep the virtualization-type of pv linux images to paravirtualized;
changed registration workflow upload policy to aws-exec-read
Merge branch 'testing' into dev/dmitrii/upload-acl-fix
refactored euca_execlp() to enable log propagation
Adds ec2-bundle-read to canned-acls supported by object storage
EUCA-9174: generate unique download manifest name
Merge branch 'dev/spark/EUCA-9174' into testing
introducing euca_execlp_log and using it for workflow invocations
EUCA-9088, sending object creation event when completeMultipartUpload is called
fixed non-default arg placement error