test: extract common JTW code from the multi-tenancy.sh test

Move some code related to using JWT tokens from the `multi-tenancy.sh`
test case to `test/cases/api/common/common.sh`, `tools/provision.sh`
and `tools/run-mock-auth-servers.sh`. Move the composer and worker
configuration from the test to new testing configuration files.

The `tools/provision.sh` now accepts an optional argument specifying the
authentication method to use with the provisioned composer and workers.
Valid values are `tls` and `jwt`. If no argument is specified, the `tls`
option is used and the script defaults to its previous behavior.

test/cases/api/common/common.sh

@@ -44,3 +44,28 @@ function _instanceCheck() {
     echo "Not RHEL OS. Skip subscription check."
   fi
 }
+
+# Fetch a JWT token
+function access_token {
+  # Refresh token represents the ORG ID
+  local refresh_token="$1"
+  curl --request POST \
+    --data "refresh_token=$refresh_token" \
+    --header "Content-Type: application/x-www-form-urlencoded" \
+    --silent \
+    --show-error \
+    --fail \
+    localhost:8081/token | jq -r .access_token
+}
+
+# Get the compose status using a JWT token
+function compose_status {
+  local compose="$1"
+  local refresh_token="$2"
+  curl \
+    --silent \
+    --show-error \
+    --fail \
+    --header "Authorization: Bearer $(access_token "$refresh_token")" \
+    "http://localhost:443/api/image-builder-composer/v2/composes/$compose"
+}