This commit adds support for cri-o by changing the binary initially used
to run CNI plugin to runc and falling back to docker only in case it's
not available.
Also DevStack support for installing and configuring Kubernetes with
cri-o is added.
Implements: blueprint crio-support
Depends-On: Ib049d66058429e499f5d0932c4a749820bec73ff
Depends-On: Ic3c7d355a455298f43e37fb2aceddfd1e7eefaf2
Change-Id: I081edf0dbd4eb57826399c4820376381950080ed
eecd44d335