Fix up TEST_METADATA

- `TEST_METADATA.foo` should be `TEST_METADATA.run_tests`: this will unbreak
  trying to run the tests on a system without python installed in $PATH.
- The tests require root because they load aesni(4) and/or cryptodev(4) if
  not already loaded.

MFC after:	2 weeks
Sponsored by:	Dell EMC Isilon

tests/sys/opencrypto/Makefile

@@ -7,7 +7,9 @@ BINDIR=		${TESTSDIR}
 
 PLAIN_TESTS_SH=	runtests
 
-TEST_METADATA.foo+=required_programs="python"
+TEST_METADATA.runtests+= required_programs="python"
+TEST_METADATA.runtests+= required_user="root"
+
 PYMODULES=	cryptodev.py cryptodevh.py cryptotest.py dpkt.py
 
 ${PACKAGE}FILES+=	${PYMODULES}