Fix client auth in policy resources

Following SDK change that validates http security context to
contain auth type, we need to avoid setting http security context
when TLS client auth is responsible for authentication.

nsxt/provider.go

@@ -507,7 +507,9 @@ func configurePolicyConnectorData(d *schema.ResourceData, clients *nsxtClients)
 
 	httpClient := http.Client{Transport: tr}
 	clients.PolicyHTTPClient = &httpClient
-	clients.PolicySecurityContext = securityCtx
+	if securityContextNeeded {
+		clients.PolicySecurityContext = securityCtx
+	}
 	clients.Host = host
 
 	return nil
@@ -534,6 +536,8 @@ func providerConfigure(d *schema.ResourceData) (interface{}, error) {
 func getPolicyConnector(clients interface{}) *client.RestConnector {
 	c := clients.(nsxtClients)
 	connector := client.NewRestConnector(c.Host, *c.PolicyHTTPClient)
-	connector.SetSecurityContext(c.PolicySecurityContext)
+	if c.PolicySecurityContext != nil {
+		connector.SetSecurityContext(c.PolicySecurityContext)
+	}
 	return connector
 }