GODRIVER-1762 increase test timeout (#572)

Author: iwysiu

Makefile

@@ -14,7 +14,7 @@ PKGS = $(BSON_PKGS) $(EVENT_PKGS) $(MONGO_PKGS) $(UNSTABLE_PKGS) $(TAG_PKG) $(EX
 TEST_PKGS = $(BSON_TEST_PKGS) $(EVENT_TEST_PKGS) $(MONGO_TEST_PKGS) $(UNSTABLE_TEST_PKGS) $(TAG_PKG) $(EXAMPLES_TEST_PKGS)
 ATLAS_URIS = "$(ATLAS_FREE)" "$(ATLAS_REPLSET)" "$(ATLAS_SHARD)" "$(ATLAS_TLS11)" "$(ATLAS_TLS12)" "$(ATLAS_FREE_SRV)" "$(ATLAS_REPLSET_SRV)" "$(ATLAS_SHARD_SRV)" "$(ATLAS_TLS11_SRV)" "$(ATLAS_TLS12_SRV)"
 
-TEST_TIMEOUT = 600
+TEST_TIMEOUT = 1800
 
 .PHONY: default
 default: check-env check-fmt vet build-examples lint errcheck test-cover test-race