Changes in vimconn_vmware.py:

1. Added stub code for SRIOV defect 123: Create a means to assign SR-IOV via vCenter APIs.
2. Change in logic of getting PCI configuration
3. Addressed code review comments
4. Resolve merge conflicts
Change-Id: Id3ad2fdb1a786438031d3ff9e50ec84dfa86d68f
Signed-off-by: kate <akate@vmware.com>