README.md: Add automount key and map, fix ref to hbacsvcgroup and test

The main REAADME has been fixed to contain information about the
automount key and map modules, the reference to the hbacsvcgroup README
has been fixed and a new test has been added as a github workflow.

.github/workflows/readme.yml

+---
+name: readme test
+on:
+  - push
+  - pull_request
+jobs:
+  ansible_test:
+    name: Verify readme
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Run readme test
+        run: |
+          error=0
+          for i in README-*.md; do grep -q $i README.md && echo "OK: $i" || { echo -e "\033[31;1mERROR: ${i} missing\033[0m"; error=1; } done
+          exit $error

README.md

@@ -13,7 +13,9 @@ Features
 * Repair mode for clients
 * Backup and restore, also to and from controller
 * Modules for automembership rule management
+* Modules for automount key management
 * Modules for automount location management
+* Modules for automount map management
 * Modules for config management
 * Modules for delegation management
 * Modules for dns config management
@@ -425,7 +427,9 @@ Modules in plugin/modules
 =========================
 
 * [ipaautomember](README-automember.md)
+* [ipaautomountkey](README-automountkey.md)
 * [ipaautomountlocation](README-automountlocation.md)
+* [ipaautomountmap](README-automountmap.md)
 * [ipaconfig](README-config.md)
 * [ipadelegation](README-delegation.md)
 * [ipadnsconfig](README-dnsconfig.md)
@@ -435,7 +439,7 @@ Modules in plugin/modules
 * [ipagroup](README-group.md)
 * [ipahbacrule](README-hbacrule.md)
 * [ipahbacsvc](README-hbacsvc.md)
-* [ipahbacsvcgroup](README-hbacsvc.md)
+* [ipahbacsvcgroup](README-hbacsvcgroup.md)
 * [ipahost](README-host.md)
 * [ipahostgroup](README-hostgroup.md)
 * [ipalocation](README-location.md)