Allow adding in other special characters in the password

This mainly pertains to single quotes, but the test includes others as
well.

spec/acceptance/server_spec.rb

@@ -184,7 +184,7 @@ class { 'mongodb::globals':
           handle_creds   => true,
           store_creds    => true,
           admin_username => 'admin',
-          admin_password => 'admin_\\_password',
+          admin_password => 'admin_\\_\'_"_&_password',
           restart        => true,
         }
         class { 'mongodb::client': }
@@ -220,7 +220,7 @@ class { 'mongodb::client': }
       it { is_expected.to be_owned_by 'root' }
       it { is_expected.to be_grouped_into 'root' }
       it { is_expected.to be_mode 600 }
-      it { is_expected.to contain 'admin.auth(\'admin\', \'admin_\\\\_password\')' }
+      it { is_expected.to contain 'admin.auth(\'admin\', \'admin_\\\\_\\\'_"_&_password\')' }
     end
 
     describe command("mongosh admin --quiet --eval \"load('/root/.mongoshrc.js');EJSON.stringify(db.getUser('admin')['customData'])\"") do

spec/classes/server_spec.rb

@@ -453,19 +453,19 @@
               with_content(%r{admin\.auth\('admin', 'password'\)})
           }
 
-          context 'with backslash in password' do
+          context 'with complex password' do
             let :params do
               {
                 admin_username: 'admin',
-                admin_password: 'password_\_with_backslash',
+                admin_password: 'complex_\\_\'_"_&_password',
                 auth: true,
                 store_creds: true
               }
             end
 
             it {
               is_expected.to contain_file('/root/.mongoshrc.js').
-                with_content(%r{admin\.auth\('admin', 'password_\\\\_with_backslash'\)})
+                with_content(%r{admin\.auth\('admin', 'complex_\\\\_\\\'_"_&_password'\)})
             }
           end
         end

templates/mongoshrc.js.erb

@@ -34,7 +34,7 @@ if (authRequired()) {
   <%- end -%>
   try {
     admin = db.getSiblingDB('admin')
-    admin.auth('<%= @admin_username %>', '<%= @admin_password_unsensitive.gsub('\\','\\\\\\\\') %>')
+    admin.auth('<%= @admin_username %>', '<%= @admin_password_unsensitive.gsub('\\','\\\\\\\\').gsub("'","\\\\'") %>')
   }
   catch (err) {
     // Silently ignore this error, we can't really do anything about it.