Fixed wrap so that the conf_flag is passed to PyKerberos.
Fixed wrap so that the conf_flag is passed to PyKerberos.

The conf_flag controls whether gss_wrap applies encryption to the passed in
buffer.  If the conf_flag is set to 1, then encryption will be applied to the
buffer, if it is 0, then the buffer will only be signed.  The conf_flag is the
third variable to the gss_wrap call in the MIT Kerberos library.

Also modified unwrap so that the returned conf flag is checked to see if the
server is honoring the negotiated QOP value.

Note: in order for these changes to work, changes to PyKerberos also had to be
made.

thobbs/pure-sasl