HMAC function rename for consistency

Make sure that HMAC function names conform to previously established get_*,
set_* naming convention.

test/fko-python.py

@@ -0,0 +1,37 @@
+#!/usr/bin/python
+
+#
+# Import the Fko class and all constants.
+#
+from fko import *
+
+# Create an Fko instance with an empty context.
+#
+fko = Fko()
+
+fko.hmac_type(FKO_HMAC_SHA512)
+
+# Set the SPA message (Note: Access request is default if not specified).
+#
+fko.spa_message("0.0.0.0,tcp/22")
+
+# Create the final SPA data message string.
+#
+fko.spa_data_final("testtest", "blah")
+
+# print the spa message.
+#
+print fko.spa_data()
+
+# Print some of the data:
+#
+print "Version:", fko.version()
+print "Timestamp:", fko.timestamp()
+print "Username:", fko.username()
+print "Digest Type (value):", fko.digest_type()
+print "Digest Type (string):", fko.digest_type_str()
+print "Digest:", fko.spa_digest()
+print "HMAC Type (value):", fko.hmac_type()
+print "HMAC Type (string):", fko.hmac_type_str()
+print "HMAC:", fko.get_spa_hmac()
+print "SPA Message:", fko.spa_message()