Missing the version of org.apache.maven.plugins:maven-deploy-plugin.

Since the current pom.xml on the top directory of the nic.git misses the version of maven-deploy-plugin, the following WARNING messages are output in the maven build.

[WARNING]
[WARNING] Some problems were encountered while building the effective model for org.opendaylight.nic:nic-aggregator:pom:1.1.0-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-deploy-plugin is missing. @ line 46, column 21
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]