vimconn_vmware.py : Two patches to address the following two issues: 1.DHCP...

vimconn_vmware.py : Two patches to address the following two issues: 1.DHCP address not returned from vCloud Director 2.VM not powering back on in vCloud Director
3.Modified code for replacing hardcoded values.

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