Remove all dependencies on hpcloud maven repository

Changes to match the newest version of the influxdb java API. This
is the one on the public maven repository. This may require deletion
of the influxdb in the local maven repository if it is the version
from hpcloud nexus as they both have the same version number

Changed mon-persister start to pick up vertica jdbc jar from
/opt/mon/vertica since vertica jdbc jar can't be redistributed

Removed vertica jdbc jar and hpcloud nexus from pom.xml

Change-Id: I0bfc97a1e88638bdda3960ca025140cf3a486e8b