gem_module: Use --norc to avoid surprises

Run install and uninstall actions with `--norc`. This way ansible has
more control over the way gems are installed.

plugins/modules/packaging/language/gem.py

@@ -200,6 +200,7 @@ def uninstall(module):
     cmd = get_rubygems_path(module)
     environ = get_rubygems_environ(module)
     cmd.append('uninstall')
+    cmd.append('--norc')
     if module.params['install_dir']:
         cmd.extend(['--install-dir', module.params['install_dir']])
 
@@ -228,6 +229,7 @@ def install(module):
 
     cmd = get_rubygems_path(module)
     cmd.append('install')
+    cmd.append('--norc')
     if module.params['version']:
         cmd.extend(['--version', module.params['version']])
     if module.params['repository']:

tests/integration/targets/gem/tasks/main.yml

@@ -185,35 +185,35 @@
     name: gist
     state: present
     bindir: "{{ output_dir }}/custom_bindir"
-    user_install: no  # Avoid conflicts between --install-dir and --user-install when running as root on CentOS / Fedora / RHEL
   register: install_gem_result
 
-- name: Get stats of gem executable
-  stat:
-    path: "{{ output_dir }}/custom_bindir/gist"
-  register: gem_bindir_stat
+- name: Find gem executable
+  find:
+    paths: "{{ output_dir }}/custom_bindir"
+    patterns: "gist*"
+  register: gem_bindir_search
 
 - name: Ensure gem executable was installed in custom directory
   assert:
     that:
       - install_gem_result is changed
-      - gem_bindir_stat.stat.exists and gem_bindir_stat.stat.isreg
+      - gem_bindir_search.files | length == 1
 
 - name: Remove gem with custom bindir
   gem:
     name: gist
     state: absent
     bindir: "{{ output_dir }}/custom_bindir"
-    user_install: no  # Avoid conflicts between --install-dir and --user-install when running as root on CentOS / Fedora / RHEL
   register: install_gem_result
 
-- name: Get stats of gem executable
-  stat:
-    path: "{{ output_dir }}/custom_bindir/gist"
-  register: gem_bindir_stat
+- name: Find gem executable
+  find:
+    paths: "{{ output_dir }}/custom_bindir"
+    patterns: "gist*"
+  register: gem_bindir_search
 
 - name: Ensure gem executable was removed from custom directory
   assert:
     that:
       - install_gem_result is changed
-      - not gem_bindir_stat.stat.exists
+      - gem_bindir_search.files | length == 0