Update setup.py: thrift-sasl is needed for ldap/plain authentication (#446)
Update setup.py: thrift-sasl is needed for ldap/plain authentication (#446)

thrift-sasl dependency was installed only with kerberos support.
This is incorrect as thrift-sasl is needed for ldap/plain authentication
as well.

Co-authored-by: Attila Jeges <8be7e7ed20ad99068540b926b43422feb8d3afd7@cloudera.com>
cloudera/impyla,cloudera/impyla