test: Use yq for yaml2json when available

Signed-off-by: Ricardo Branco <rbranco@suse.de>

test/README.md

@@ -45,6 +45,7 @@ The test currently depend on:
  - tar
  - docker
  - systemd/systemctl
+ - yq
 
 Most of these are only required for a few tests so it is not a big issue if not everything is installed. Only a few test should fail then.
 

test/system/710-kube.bats

@@ -14,10 +14,14 @@ capabilities='{"drop":["CAP_FOWNER","CAP_SETFCAP"]}'
 
 # filter: convert yaml to json, because bash+yaml=madness
 function yaml2json() {
-    python3 -c 'import yaml
+    if command -v yq >/dev/null; then
+        yq -p yaml -o json
+    else
+        python3 -c 'import yaml
 import json
 import sys
 json.dump(yaml.safe_load(sys.stdin), sys.stdout)'
+    fi
 }
 
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