autotest: Fix WiFi hostname creation in WiFiLab

Fix WiFi tests to create server and router names that look like
hostname-rspro instead of hostname-rsproe.

BUG=None
TEST=wifi_test_utils.get_server_addr_in_lab('hostname') returns
'hostname-rspro'.

Change-Id: I2fdb49a9a036aa1695e0156d4c2e534f36257f79
Reviewed-on: https://gerrit.chromium.org/gerrit/45238
Tested-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
1 file changed