add "info" as an alias to "capabilities"

Change-Id: Ia07554250a6aae8f3a6be6a70f83690ec3fc108c
TCP port is appended two time in ClientException

urlparse netloc contains the TCP port if presents.
There is no need to provide conn.port when building
CLientException.

Change-Id: Id3e4fa8c4f4ab2ad693b0e8702ab69ed7c291830
Improve help strings

Make help strings more consistent:
* Fix wording and grammar, remove duplicated words
* Add "." consistently everywhere.

Change-Id: I37f94600df2a58532633f6bab2ab82fc5e91a75b
Merge "TCP port is appended two time in ClientException"
Merge "Improve help strings"