tests: Add test for IDL memory leak.

Multiple leaks detected for memory allocated by ovsdb_idl_txn_add_map_op.

For instance:
Direct leak of 24 byte(s) in 1 object(s) allocated from:
    0 0x4e60a7 in calloc (./tests/test-ovsdb+0x4e60a7)
    1 0x5f9b32 in xcalloc__ ./lib/util.c:125:31
    2 0x5f9b60 in xzalloc__ ./lib/util.c:135:12
    3 0x5f9c25 in xzalloc ./ovs/lib/util.c:169:12
    4 0x5d4899 in ovsdb_idl_txn_add_map_op ./lib/ovsdb-idl.c:4175:29
    5 0x5d4758 in ovsdb_idl_txn_write_partial_map ./lib/ovsdb-idl.c:4332:5
    6 0x53cbe8 in idltest_simple2_update_smap_setkey ./tests/idltest.c:4701:5
    7 0x526fe2 in do_idl_partial_update_map_column ./tests/test-ovsdb.c:3027:5
    8 0x59d99c in ovs_cmdl_run_command__ ./lib/command-line.c:247:17
    9 0x59d79a in ovs_cmdl_run_command ./lib/command-line.c:278:5
    10 0x51d458 in main ./tests/test-ovsdb.c:80:5
    11 0x7f0a20a79b74 in __libc_start_main (/lib64/libc.so.6+0x27b74)

Signed-off-by: Xavier Simonart <xsimonar@redhat.com>

tests/ovsdb-idl.at

@@ -1881,7 +1881,10 @@ OVSDB_CHECK_IDL_PARTIAL_UPDATE_MAP_COLUMN([map, simple2 idl-partial-update-map-c
 007: name=String2 smap=[[key2 : value2]] imap=[[3 : myids2]]
 008: After trying to delete a deleted element
 009: name=String2 smap=[[key2 : value2]] imap=[[3 : myids2]]
-010: End test
+010: After Create and Delete element
+011: name=String2 smap=[[key2 : value2]] imap=[[3 : myids2]]
+012: End test
+
 ]])
 
 OVSDB_CHECK_IDL_PY([partial-map idl],

tests/test-ovsdb.c

@@ -3020,6 +3020,19 @@ do_idl_partial_update_map_column(struct ovs_cmdl_context *ctx)
     printf("%03d: After trying to delete a deleted element\n", step++);
     dump_simple2(idl, myRow, step++);
 
+    myTxn = ovsdb_idl_txn_create(idl);
+    myRow = idltest_simple2_insert(myTxn);
+    idltest_simple2_get_smap(myRow, OVSDB_TYPE_STRING,
+                                    OVSDB_TYPE_STRING);
+    idltest_simple2_update_smap_setkey(myRow, "key3", "myList3");
+    idltest_simple2_set_name(myRow, "String2");
+    idltest_simple2_delete(myRow);
+    ovsdb_idl_txn_commit_block(myTxn);
+    ovsdb_idl_txn_destroy(myTxn);
+    ovsdb_idl_get_initial_snapshot(idl);
+    printf("%03d: After Create and Delete element\n", step++);
+    dump_simple2(idl, myRow, step++);
+
     ovsdb_idl_destroy(idl);
     printf("%03d: End test\n", step);
 }