tests: allow migrate() to take extra flags

For example, we can pass in '"resume": true' to resume a migration.
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: NJuan Quintela <quintela@redhat.com>
Reviewed-by: NBalamuruhan S <bala24@linux.vnet.ibm.com>
Signed-off-by: NPeter Xu <peterx@redhat.com>
Message-Id: <20180710091902.28780-7-peterx@redhat.com>
Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>

tests/migration-test.c

@@ -337,14 +337,14 @@ static void migrate_set_capability(QTestState *who, const char *capability,
     qobject_unref(rsp);
 }
 
-static void migrate(QTestState *who, const char *uri)
+static void migrate(QTestState *who, const char *uri, const char *extra)
 {
     QDict *rsp;
     gchar *cmd;
 
     cmd = g_strdup_printf("{ 'execute': 'migrate',"
-                          "'arguments': { 'uri': '%s' } }",
-                          uri);
+                          "  'arguments': { 'uri': '%s' %s } }",
+                          uri, extra ? extra : "");
     rsp = qtest_qmp(who, cmd);
     g_free(cmd);
     g_assert(qdict_haskey(rsp, "return"));
@@ -540,7 +540,7 @@ static int migrate_postcopy_prepare(QTestState **from_ptr,
     /* Wait for the first serial output from the source */
     wait_for_serial("src_serial");
 
-    migrate(from, uri);
+    migrate(from, uri, NULL);
     g_free(uri);
 
     wait_for_migration_pass(from);
@@ -586,7 +586,7 @@ static void test_baddest(void)
     if (test_migrate_start(&from, &to, "tcp:0:0", true)) {
         return;
     }
-    migrate(from, "tcp:0:0");
+    migrate(from, "tcp:0:0", NULL);
     do {
         rsp = wait_command(from, "{ 'execute': 'query-migrate' }");
         rsp_return = qdict_get_qdict(rsp, "return");
@@ -630,7 +630,7 @@ static void test_precopy_unix(void)
     /* Wait for the first serial output from the source */
     wait_for_serial("src_serial");
 
-    migrate(from, uri);
+    migrate(from, uri, NULL);
 
     wait_for_migration_pass(from);