VMware: Enable VMware inspector to support any port

If vCenter is configured to use any port other than 443,
the inspector fails to connect to vCenter.
This patch adds a configurable parameter host_port in
ceilometer config under vmware section.

DocImpact
Change-Id: I9035b32ffbc58bb1801b02abdce4bc83a3427308
Closes-Bug: #1387050