Port over apigen's Makefile and go.mod changes

Makefile

@@ -8,6 +8,9 @@ REPO_PATH := github.com/hashicorp/watchtower
 bootstrap:
 	go generate -tags tools tools/tools.go
 
+api:
+	APIGEN_BASEPATH=$(shell pwd) go generate -tags genapi api/internal/genapi/makeimports.go
+
 ### oplog requires protoc-gen-go v1.20.0 or later
 # GO111MODULE=on go get -u github.com/golang/protobuf/protoc-gen-go@v1.40
 proto: protolint protobuild cleanup
@@ -40,6 +43,6 @@ cleanup:
 	@rm -R ${TMP_DIR}
 
 
-.PHONY: proto
+.PHONY: api bootstrap cleanup proto
 
 .NOTPARALLEL:

go.mod

@@ -22,7 +22,7 @@ require (
 	github.com/hashicorp/go-hclog v0.12.2
 	github.com/hashicorp/go-kms-wrapping v0.5.8
 	github.com/hashicorp/go-multierror v1.0.0
-	github.com/hashicorp/go-retryablehttp v0.6.2
+	github.com/hashicorp/go-retryablehttp v0.6.6
 	github.com/hashicorp/go-rootcerts v1.0.2
 	github.com/hashicorp/go-sockaddr v1.0.2
 	github.com/hashicorp/go-uuid v1.0.2

go.sum

@@ -599,6 +599,8 @@ github.com/hashicorp/go-retryablehttp v0.5.3/go.mod h1:9B5zBasrRhHXnJnui7y6sL7es
 github.com/hashicorp/go-retryablehttp v0.5.4/go.mod h1:9B5zBasrRhHXnJnui7y6sL7es7NDiJgTc6Er0maI1Xs=
 github.com/hashicorp/go-retryablehttp v0.6.2 h1:bHM2aVXwBtBJWxHtkSrWuI4umABCUczs52eiUS9nSiw=
 github.com/hashicorp/go-retryablehttp v0.6.2/go.mod h1:gEx6HMUGxYYhJScX7W1Il64m6cc2C1mDaW3NQ9sY1FY=
+github.com/hashicorp/go-retryablehttp v0.6.6 h1:HJunrbHTDDbBb/ay4kxa1n+dLmttUlnP3V9oNE4hmsM=
+github.com/hashicorp/go-retryablehttp v0.6.6/go.mod h1:vAew36LZh98gCBJNLH42IQ1ER/9wtLZZ8meHqQvEYWY=
 github.com/hashicorp/go-rootcerts v1.0.0/go.mod h1:K6zTfqpRlCUIjkwsN4Z+hiSfzSTQa6eBIzfwKfwNnHU=
 github.com/hashicorp/go-rootcerts v1.0.1 h1:DMo4fmknnz0E0evoNYnV48RjWndOsmd6OW+09R3cEP8=
 github.com/hashicorp/go-rootcerts v1.0.1/go.mod h1:pqUvnprVnM5bf7AOirdbb01K4ccR319Vf4pU3K5EGc8=