VMware: add missing os types in vSphere sdk 6.5

add missing os types according to
https://pubs.vmware.com/vsphere-6-5/index.jsp?
topic=%2Fcom.vmware.wssdk.apiref.doc%2Fvim.vm.GuestOsDescriptor.
GuestOsIdentifier.html
Closes-Bug: #1786142

Change-Id: I1840a436361327d6d4020ba0214ede92c57c326a

Author: xhzhf

nova/virt/vmwareapi/constants.py

@@ -90,6 +90,7 @@
     'centos6Guest',
     'centos6_64Guest',
     'centos7_64Guest',
+    'centos7Guest',
     'coreos64Guest',
     'darwin10_64Guest',
     'darwin10Guest',
@@ -141,6 +142,7 @@
     'oracleLinux6Guest',
     'oracleLinux6_64Guest',
     'oracleLinux7_64Guest',
+    'oracleLinux7Guest',
     'os2Guest',
     'other24xLinux64Guest',
     'other24xLinuxGuest',