Removes hardcoded thumbprint

Use the thumbrpint from the prow secrets

Signed-off-by: Sagar Muchhal <[email protected]>

Author: srm09

test/e2e/config/vsphere-ci.yaml

@@ -140,7 +140,6 @@ variables:
   WORKER_MACHINE_COUNT: 1
   IP_FAMILY: "IPv4"
   CLUSTER_CLASS_NAME: "quick-start"
-  VSPHERE_TLS_THUMBPRINT: "18:EC:35:60:54:68:92:F6:F8:92:3E:4D:11:A1:0D:13:9C:E9:3E:B6"
   VSPHERE_DATACENTER:  "SDDC-Datacenter"
   VSPHERE_FOLDER: "clusterapi"
   VSPHERE_RESOURCE_POOL: "clusterapi"