[MJARSIGNER-48] Mark verify and sign Mojos thread safe (#2)

The Mojos are safe in the context of Maven 3 parallel builds. However running multiple Maven builds on the same signables might cause problems, but this is not something that should be covered.

Author: lasselindqvist

src/main/java/org/apache/maven/plugins/jarsigner/JarsignerSignMojo.java

@@ -48,7 +48,7 @@
  * @author <a href="[email protected]">Christian Schulte</a>
  * @since 1.0
  */
-@Mojo(name = "sign", defaultPhase = LifecyclePhase.PACKAGE)
+@Mojo(name = "sign", defaultPhase = LifecyclePhase.PACKAGE, threadSafe = true)
 public class JarsignerSignMojo extends AbstractJarsignerMojo {
 
     /**

src/main/java/org/apache/maven/plugins/jarsigner/JarsignerVerifyMojo.java

@@ -38,7 +38,7 @@
  * @author <a href="[email protected]">Christian Schulte</a>
  * @since 1.0
  */
-@Mojo(name = "verify", defaultPhase = LifecyclePhase.VERIFY)
+@Mojo(name = "verify", defaultPhase = LifecyclePhase.VERIFY, threadSafe = true)
 public class JarsignerVerifyMojo extends AbstractJarsignerMojo {
 
     /**