phyp: Resolve some file descriptor leaks

phyp: Resolve some file descriptor leaks

The phypUUIDTable_Push and phypUUIDTable_Pull leaked their file descriptors
on normal return.  Each function had an unnecessary use of creating a buffer
to print conn->uri->user and needed a bit better flow control. I also noted
that the Read function had a cut-n-paste error from the write function on a
couple of VIR_WARN's.

The openSSHSession leaked the sock on the failure path.  Additionally that
turns into the internal_socket in the phypOpen code.  That was neither saved
nor closed on any path. So I used the connnection_data->sock field to save
the socket for eventual close. Of interest here is that phypExec used the
connection_data->sock field even though it had never been initialized.