ovn-nbctl: Make daemon mode more transparent.

This makes ovn-nbctl transparently use daemon mode if an appropriate
environment variable is set.

It also transforms ovn-nbctl.at so that it runs each ovn-nbctl test in
"direct" mode and in daemon mode.  It uses a combination of m4 macros and
shell functions to keep from expanding the generated testsuite more than
necessary.

Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Mark Michelson <mmichels@redhat.com>

lib/stream-ssl.h

@@ -58,6 +58,9 @@ void stream_ssl_set_ciphers(const char *arg);
                                                         \
         case OPT_SSL_CIPHERS:                           \
             stream_ssl_set_ciphers(optarg);             \
-            break;                                      
+            break;
+
+#define STREAM_SSL_CASES \
+    case 'p': case 'c': case 'C': case OPT_SSL_PROTOCOLS: case OPT_SSL_CIPHERS:
 
 #endif /* stream-ssl.h */