ovsqlite: Explicit SQLite init/shutdown

The SQLite docs[1] say that implicit initialization might go away at
some point, so add explicit initialization.

Also, explicit shutdown might reduce the number of false positives
reported by memory leak detectors.

[1] https://www.sqlite.org/c3ref/initialize.html

Author: blgl

storage/ovsqlite/ovsqlite-server.c

@@ -547,6 +547,9 @@ open_db(void)
     bool init;
     char sqltext[64];
 
+    status = sqlite3_initialize();
+    if (status != SQLITE_OK)
+        die("SQLite3 initialization failed");
     path = concatpath(innconf->pathoverview, OVSQLITE_DB_FILE);
     init = stat(path, &sb) == -1;
     if (init) {
@@ -663,6 +666,7 @@ close_db(void)
     sqlite_helper_term(&sql_main_helper, (sqlite3_stmt **) &sql_main);
     sqlite3_close_v2(connection);
     connection = NULL;
+    sqlite3_shutdown();
 #    ifdef HAVE_ZLIB
     if (use_compression) {
         inflateEnd(&inflation);