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.

tools/run-mock-auth-servers.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+set -eu
+
+# Colorful output.
+function greenprint {
+    echo -e "\033[1;32m[$(date -Isecond)] ${1}\033[0m"
+}
+
+servers_start() {
+    greenprint "Starting mock JWT AUTH servers"
+    # Spin up an https instance for the composer-api and worker-api; the auth handler needs to hit an ssl `/certs` endpoint
+    sudo /usr/libexec/osbuild-composer-test/osbuild-mock-openid-provider -a localhost:8082 -rsaPubPem /etc/osbuild-composer/client-crt.pem -rsaPem /etc/osbuild-composer/client-key.pem -cert /etc/osbuild-composer/composer-crt.pem -key /etc/osbuild-composer/composer-key.pem &
+    # Spin up an http instance for the worker client to bypass the need to specify an extra CA
+    sudo /usr/libexec/osbuild-composer-test/osbuild-mock-openid-provider -a localhost:8081 -rsaPubPem /etc/osbuild-composer/client-crt.pem -rsaPem /etc/osbuild-composer/client-key.pem &
+}
+
+servers_stop() {
+    greenprint "Stopping mock JWT AUTH servers"
+    local KILL_PIDS=()
+    # shellcheck disable=SC2207
+    # The split is desired and should be simple enough for the shell to handle
+    KILL_PIDS=($(pgrep -f '^sudo /usr/libexec/osbuild-composer-test/osbuild-mock-openid-provider'))
+    for PID in "${KILL_PIDS[@]}"; do
+        sudo pkill -P "$PID"
+    done
+}
+
+case "$1" in
+    "start")
+        servers_start
+        ;;
+    "stop")
+        servers_stop
+        ;;
+    *)
+        echo "Usage: $0 {start|stop}"
+        exit 1
+        ;;
+esac