Bug:1238 - Revert changes to SshClientAdapter.

Fix bug introduced in 412e6b4 by reverting back to previous state.
Also fix a resource leak in writeImpl.

Change-Id: If43741071d1471280491888078f342bc33269c5f
Signed-off-by: Tomas Olvecky <tolvecky@cisco.com>
Merge "Bug:1238 - Revert changes to SshClientAdapter."