Remove unused print_md5 function.

Change-Id: I9201424a3acacea11d576df8e709f17c5a576ea2
Include pwfile.h from sasl_server_test.c

sasl_server_test.c uses free_user_ht() from the pwfile.h header.

Change-Id: I872f30e4cfc8e1ba4b122b0c8f058dc278d2ea92