Switch test cases to use libcheck framework

This keeps the test logic the same, but moves most of them into the libcheck
test suite framework.  It gives better control over grouping related tests,
running them in parallel, and reporting on multiple failures.

Running in parallel also brings problems, so libykcs11 tests are left
untouched.  Parallel access to a single hardware DUT does not make sense,
and pcsc-lite doesn't work after a fork() in OS X 10.11+, so it can't run
in libcheck's tests anyway.

configure.ac

@@ -50,6 +50,7 @@ AM_MISSING_PROG(GENGETOPT, gengetopt, $missing_dir)
 PKG_PROG_PKG_CONFIG
 
 PKG_CHECK_MODULES(OPENSSL, libcrypto)
+PKG_CHECK_MODULES([CHECK], [check >= 0.9.6])
 
 gl_LD_VERSION_SCRIPT
 gl_VALGRIND_TESTS