virfirewallmock: Replace virFindFileInPath() with virFirewallDIsRegistered()

Neither of tests that use virfirewallmock.c
(networkxml2firewalltest, nwfilterebiptablestest,
nwfilterxml2firewalltest, virfirewalltest) really call
virFindFileInPath(). But at least networkxml2firewalltest calls
virFirewallDIsRegistered(), under the hood. Now, the actual
implementation connects to dbus and something, which is
definitely not what we want in our test suite.

Therefore, drop virFindFileInPath() implementation and provide
implementation for virFirewallDIsRegistered() which just returns
-2 to signal that firewalld is not registered.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Kristina Hanicova <khanicov@redhat.com>

tests/virfirewallmock.c

@@ -17,18 +17,10 @@
 #include <config.h>
 
 #include "internal.h"
-#include "virfile.h"
+#include "virfirewalld.h"
 
-char *
-virFindFileInPath(const char *file)
+int
+virFirewallDIsRegistered(void)
 {
-    if (file &&
-        (g_strrstr(file, "ebtables") ||
-         g_strrstr(file, "iptables") ||
-         g_strrstr(file, "ip6tables"))) {
-        return g_strdup(file);
-    }
-
-    /* We should not need any other binaries so return NULL. */
-    return NULL;
+    return -2;
 }