[Fix] Plug reload leaks

src/controller.c

 
 	type = g_quark_try_string ("controller");
 
-	ctx = g_malloc0 (sizeof (struct rspamd_controller_worker_ctx));
+	ctx = rspamd_mempool_alloc0 (cfg->cfg_pool,
+			sizeof (struct rspamd_controller_worker_ctx));
 
 	ctx->magic = rspamd_controller_ctx_magic;
 	ctx->timeout = DEFAULT_WORKER_IO_TIMEOUT;

src/fuzzy_storage.c

 
 	type = g_quark_try_string ("fuzzy");
 
-	ctx = g_malloc0 (sizeof (struct rspamd_fuzzy_storage_ctx));
+	ctx = rspamd_mempool_alloc0 (cfg->cfg_pool,
+			sizeof (struct rspamd_fuzzy_storage_ctx));
 
 	ctx->magic = rspamd_fuzzy_storage_magic;
 	ctx->sync_timeout = DEFAULT_SYNC_TIMEOUT;

src/hs_helper.c

 	GQuark type;
 
 	type = g_quark_try_string ("hs_helper");
-	ctx = g_malloc0 (sizeof (*ctx));
+	ctx = rspamd_mempool_alloc0 (cfg->cfg_pool, sizeof (*ctx));
 
 	ctx->magic = rspamd_hs_helper_magic;
 	ctx->cfg = cfg;

src/rspamd_proxy.c

 
 	type = g_quark_try_string ("rspamd_proxy");
 
-	ctx = g_malloc0 (sizeof (struct rspamd_proxy_ctx));
+	ctx = rspamd_mempool_alloc (cfg->cfg_pool,
+			sizeof (struct rspamd_proxy_ctx));
 	ctx->magic = rspamd_rspamd_proxy_magic;
 	ctx->timeout = 10.0;
 	ctx->upstreams = g_hash_table_new (rspamd_strcase_hash, rspamd_strcase_equal);

src/worker.c

 
 	type = g_quark_try_string ("normal");
 
-	ctx = g_malloc0 (sizeof (struct rspamd_worker_ctx));
+	ctx = rspamd_mempool_alloc (cfg->cfg_pool,
+			sizeof (struct rspamd_worker_ctx));
 
 	ctx->magic = rspamd_worker_magic;
 	ctx->is_mime = TRUE;