New flags for setting registry request rate limits.

Record registry in image metadata

Godep workspace -> vendor/

Remove GCE/GCR-specific flags. For GCR, users should follow the direc…

…tions

provided by Google here: https://cloud.google.com/container-registry/docs/auth#using_a_json_key_file
Doing this enables GCR to look like any other registry,
and it removes all dependencies on Kubernetes packages for Collector.

Remove GCE/GCR-specific flags. For GCR, users should follow the direc…

…tions

provided by Google here: https://cloud.google.com/container-registry/docs/auth#using_a_json_key_file
Doing this enables GCR to look like any other registry,
and it removes all dependencies on Kubernetes packages for Collector.

Improved metadata comparison check.

Support docker password with ":". Regexp detection of RH 5/6.

Support docker password with ":". Regexp detection of RH 5/6.

Detect more "docker pull" timeouts and errors.

Ensure pulled images have expected IDs.