test/ping_pod_from_pod: fix
test/ping_pod_from_pod: fix

1. The bats `run` command always returns 0 exit code, so
   `ping_pod_from_pod` never tested anything, as it always succeeded.

2. Using `$output=$(run cmd)` is wrong, since `run` assigns the output
   itself, and do not print anything per se (so `$output` is always
   empty in this case).

3. Using `exit 1` from the function is excessive.

4. There is no need for the whole `if ... ` construct, as bats tests are
   run with `set -e` and if the ping fails the test will fail.

Fix the `ping_pod` in the same way.

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

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