Introduce new property to control enforcer execution

Add new property master_enforcerCheck_skip whith default value of
master_sanityCheck_skip that controls the execution of the enforcer
plugin only.
This allows to skip enforcer rules while executing all other sanity
checks.
diff --git a/maven_plugin_config-master/pom.xml b/maven_plugin_config-master/pom.xml
index 9494c97..5f99de4 100644
--- a/maven_plugin_config-master/pom.xml
+++ b/maven_plugin_config-master/pom.xml
@@ -40,6 +40,7 @@
     <master_deployAtEnd>true</master_deployAtEnd>
     <master_sanityCheck_skip>false</master_sanityCheck_skip>
     <master_signatureCheck_skip>${master_sanityCheck_skip}</master_signatureCheck_skip>
+    <master_enforcerCheck_skip>${master_sanityCheck_skip}</master_enforcerCheck_skip>
 
     <!-- Test Control -->
     <master_unitTest_skip>false</master_unitTest_skip>
@@ -422,7 +423,7 @@
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-enforcer-plugin</artifactId>
           <configuration>
-            <skip>${master_sanityCheck_skip}</skip>
+            <skip>${master_enforcerCheck_skip}</skip>
             <rules>
               <requirePluginVersions>
                 <message>Build reproducibility : always define plugin versions</message>