Handle socket connection error in SSH client
Handle socket connection error in SSH client

Catch socket error raised when connecting to the server over SSH
and raise a GerritError.

Change-Id: I140a26be4bc04ec229d95faaa80b94477cf96645

morucci/pygerrit,dpursehouse/pygerrit2,benjiii/pygerrit,dpursehouse/pygerrit,gferon/pygerrit2,sonyxperiadev/pygerrit,markon/pygerrit2