Cleanup memory in asn.1 testsuite to allow for leak checking

Cleanup memory in asn.1 testsuite to allow for leak checking

	* krb5_decode_test.c: Modify decode_run macro to take a cleanup
	handler to free allocated memory. Add static handlers to free
	krb5_alt_method, passwd_phrase_element and krb5_enc_data as the
	krb5 library does not handle at this time.

	* krb5_encode_test.c: Free krb5_context at end. Utilize the many
	ktest_empty and detroy functions to cleanup memory.

	* ktest.h, ktest.c: Add many ktest free and empty functions to
	cleanup allocated structures in tests.

	* utility.c (krb5_data_hex_parse): Free temporary data.

With these changes, one can then test for memory leaks in the
asn.1 and krb5_free functions.

ticket: new
tags: pullup

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@15413 dc483132-0cff-0310-8789-dd5450dbe970