test/ctr.bats: convert python calls to jq
test/ctr.bats: convert python calls to jq

This looks much cleaner and easier to read.

While at it, simplify some temporary file names.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

kubernetes-incubator/cri-o,kubernetes-incubator/ocid,kubernetes-incubator/cri-o,nalind/cri-o,nalind/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/ocid,nalind/cri-o,kubernetes-incubator/ocid