take md5 of cache_id to prevent it from being too long

[fabianvf]

No description provided.

[fabianvf]

/cherrypick master

[openshift-cherrypick-robot]

@fabianvf: once the present PR merges, I will cherry-pick it on top of master in a new PR and assign it to you.

In response to this:

/cherrypick master

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[openshift-cherrypick-robot]

@fabianvf: #259 failed to apply on top of branch "master":

error: Failed to merge in the changes.
Using index info to reconstruct a base tree...
M	openshift/dynamic/client.py
Falling back to patching base and 3-way merge...
Auto-merging openshift/dynamic/client.py
CONFLICT (content): Merge conflict in openshift/dynamic/client.py
Patch failed at 0001 take md5 of cache_id to prevent it from being too long

In response to this:

/cherrypick master

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.