VMware: Using auto-gen table in cinder driver doc

Currently, the configuration options for VMware VMDK drivers are
hard-coded in the reference source xml (doc/config-reference/
block-storage/drivers/vmware-vmdk-driver.xml). This change replaces
the hard-coded configuration options with a reference to auto-generated
config options file at doc/common/tables/cinder-vmware.xml.

Closes-Bug: #1245784
backport: havana
Change-Id: I4efb85ef0d1e082eac77daa1722b6bab831ae67d