[ONOS-1925]
1.fix javadocs bugs.
2.add pcep tunnel provider;
3.change pcep to pcep app;
4.fix some bugs according to review suggestions.

Change-Id: I4b90d9bf871dee3be70615d66db3d74f2fd85389
diff --git a/providers/pom.xml b/providers/pom.xml
index d59b2b6..a2ba12c 100644
--- a/providers/pom.xml
+++ b/providers/pom.xml
@@ -38,6 +38,7 @@
         <module>netconf</module>
         <module>null</module>
         <module>tunnel</module>
+        <module>pcep</module>
     </modules>
 
     <dependencies>