Changes in vimconn_vmware.py :

1. Created a means to assign PCI passthrough configurations to VM via vCenter APIs using pyvmomi python library.
2. Modified refresh_vms_status() : to include information of PCI devices of VMs
Changes in scripts/install-openmano.sh: Added pip install command to install pyvmomi python library

Signed-off-by: bhangare <sbhangare@vmware.com>