meta-facebook: obmc-console: Add client configuration to specify exit sequence

It can be fairly difficuly to specify a non-printable character
as an escape sequence to obmc-console-client using the -e parameter.
Thus, add a client configuration which can be used by users and
other scripted tooling to specify the escape sequence expected
by FB machine users.

Tested on yosemite4:
```
obmc-console-client -c /etc/obmc-console/client.conf -i host1
<Issue Ctrl+Lx to observe that we exit the console>
```

Change-Id: Iefe3b23dbbb8a11e52d2b09e8b0d4095f30f0ee1
Signed-off-by: Amithash Prasasd <amithash@meta.com>
diff --git a/meta-facebook/recipes-phosphor/console/obmc-console/client.conf b/meta-facebook/recipes-phosphor/console/obmc-console/client.conf
new file mode 100644
index 0000000..d84c004
--- /dev/null
+++ b/meta-facebook/recipes-phosphor/console/obmc-console/client.conf
@@ -0,0 +1,3 @@
+# Specify the escape sequence <Ctrl+L>x which is usable by
+# existing FB tooling.
+escape-sequence =  x