Add mocks for testing network allocator

Adds mocks, and the makefile rules to generate them. Readds a vendoring
of the mocking library.

Signed-off-by: Drew Erny <drew.erny@docker.com>

Makefile

@@ -24,6 +24,8 @@ VNDR=$(shell which vndr || echo '')
 
 GO_LDFLAGS=-ldflags "-X `go list ./version`.Version=$(VERSION)"
 
+MOCKS_PACKAGE=mocks
+
 .PHONY: clean all AUTHORS fmt vet lint build binaries test integration setup generate protos checkprotos coverage ci check help install uninstall dep-validate
 .DEFAULT: default
 
@@ -49,6 +51,7 @@ setup: ## install dependencies
 	@go get -u github.com/client9/misspell/cmd/misspell
 	@go get -u github.com/lk4d4/vndr
 	@go get -u github.com/stevvooe/protobuild
+	@go get -u github.com/golang/mock/mockgen
 
 generate: protos
 	@echo "🐳 $@"
@@ -119,8 +122,9 @@ bin/%: cmd/% FORCE
 binaries: $(BINARIES) ## build binaries
 	@echo "🐳 $@"
 
-clean: ## clean up binaries
+clean: ## clean up binaries and mocks
 	@echo "🐳 $@"
+	@rm -r $(MOCKS_PACKAGE)
 	@rm -f $(BINARIES)
 
 install: $(BINARIES) ## install binaries
@@ -157,3 +161,18 @@ dep-validate:
 		(echo >&2 "+ inconsistent dependencies! what you have in vendor.conf does not match with what you have in vendor" && false)
 	@rm -Rf vendor
 	@mv .vendor.bak vendor
+
+mocks: mock-ipam mock-driver mock-port
+	@echo "🐳 $@"
+
+mock-ipam: manager/allocator/network/ipam/ipam.go
+	mkdir -p mocks/mock_ipam/
+	mockgen -source=$^ -destination=$(MOCKS_PACKAGE)/mock_ipam/mock_ipam.go
+
+mock-driver: manager/allocator/network/driver/driver.go
+	mkdir -p mocks/mock_driver/
+	mockgen -source=$^ -destination=$(MOCKS_PACKAGE)/mock_driver/mock_driver.go
+
+mock-port: manager/allocator/network/port/port.go
+	mkdir -p mocks/mock_port/
+	mockgen -source=$^ -destination=$(MOCKS_PACKAGE)/mock_port/mock_port.go