Extend _ManageSSH docstring with a note for current directory
Extend _ManageSSH docstring with a note for current directory

If some sequence of commands is executed from tests using SSHClient
instance for each execution, there can be wrong expectation that
the previous command can change the current directory, and the next
command can be executed within the changed directory.
Actually, each invocation of SSHClient instance change the current
directory to the root of current user home directory.

- add a note to _ManageSSH docstring about the SSHClient behaviour.

Change-Id: I2585c68ada685460c4254c2728482961b3878753

stackforge/fuel-devops,stackforge/fuel-devops