Add remote user for RemoteProcress

Use it to set root user for SysmoBTS, otherwise if osmo-gsm-tester is
run by another user it will fail to connect

Change-Id: I67d4126fc75cb9c2d249c713cd6f14db1f1e21da
diff --git a/selftest/process_test.py b/selftest/process_test.py
index 9ad082b..71523c9 100755
--- a/selftest/process_test.py
+++ b/selftest/process_test.py
@@ -38,7 +38,7 @@
 test_ssh = False
 if test_ssh:
     # this part of the test requires ability to ssh to localhost
-    p = process.RemoteProcess('localhost', '/tmp', 'ssh-test', tmpdir,
+    p = process.RemoteProcess('ssh-test', '/tmp', os.getenv('USER'), 'localhost', tmpdir,
                               ('ls', '-al'))
     p.launch()
     p.wait()