Remove 'pva' module from pom.xml

The pva module was refactored for use by the DPM project and should not be part of the phoebus-fnal package.
Fixes #84

Author: mgonzal1

pom.xml

@@ -58,7 +58,6 @@
     <module>alarm-server-fnal</module>
     <module>scan-app-fnal</module>
     <module>scan-server-fnal</module>
-    <module>pva</module>
   </modules>
 
 </project>