[ONOS-3370] Extract hostprovider and lldpprovider from openflow

There are three independent apps:
    - openflow-base
    - hostprovider
    - lldpprovider
And there is also one meta-application called openflow that
contains all three of them.

Also fix the dependency issue when the apps are loaded from disk

Change-Id: I6da584e03593db9094b3a57976b28291f207c3c6
diff --git a/providers/openflow/pom.xml b/providers/openflow/pom.xml
index c098a60..1250af6 100644
--- a/providers/openflow/pom.xml
+++ b/providers/openflow/pom.xml
@@ -37,6 +37,7 @@
         <module>flow</module>
         <module>group</module>
         <module>meter</module>
+        <module>base</module>
         <module>app</module>
     </modules>