Switch Tunnel rpc generation bug

[MaksymPry]

When sai_rpc_server.cpp is generated sai_thrift_create_switch_tunnel function is affected by the following rule:

SAI/meta/templates/sai_rpc_server_functions.tt

Lines 118 to 120 in 2c74f46

	[%- IF function_name.match(create_switch_function) %]
	[%- PROCESS check_switch_id %]
	[%- END %]

This leads to returning the switch object instead of creating a switch tunnel:

sai_thrift_object_id_t sai_thrift_create_switch_tunnel(const std::vector<sai_thrift_attribute_t> & attr_list) {
sai_status_t status = SAI_STATUS_SUCCESS;
sai_object_id_t switch_tunnel_oid_out = SAI_NULL_OBJECT_ID;

// need to check if the switch exist
if (switch_id != SAI_NULL_OBJECT_ID) {
    return switch_id;
}

//check if the switch created in syncd
if (gSwitchId != SAI_NULL_OBJECT_ID) {
  switch_id = gSwitchId;
  return switch_id;
}
...

Perhaps we should check for the exact function name and not to match on a substring.