libsemanage: fix src/pywrap-test.py -v -F

Running "libsemanage/src/pywrap-test.py -v -F" gives following error:

    Traceback (most recent call last):
      File "pywrap-test.py", line 1139, in <module>
        sys.exit(main())
      File "pywrap-test.py", line 1121, in main
        tests.run(sh)
      File "pywrap-test.py", line 107, in run
        self.test_writefcontext(handle)
      File "pywrap-test.py", line 622, in test_writefcontext
        if self.verbose: print "SEFContext type set: ", semanage.semanage_fcontext_get_type_str(fcon)
    TypeError: in method 'semanage_fcontext_get_type_str', argument 1 of type 'int'

The argument of semanage_fcontext_get_type_str is the type recorded in
fcon and not fcon itself.  This type can be retrieved with
semanage_fcontext_get_type.
libsemanage: use semanage_bool_get_value to print a boolean

... and not semanage_bool_set_value.

This fixes "python2 pywrap-test.py -v -B -C"