vendor: Switch from godep to glide tool

* Use glide for dependency management
* coreos/docs#775

Documentation/dev/develop.md

@@ -23,7 +23,7 @@ Alternately, build a Docker image `coreos/bootcfg:latest`.
 
     sudo ./build-docker
 
-## Check Version
+## Version
 
     ./bin/bootcfg -version
     sudo rkt --insecure-options=image run bootcfg.aci -- -version
@@ -41,4 +41,19 @@ Run the ACI with rkt on `metal0`.
 
 Alternately, run the Docker image on `docker0`.
 
-    sudo docker run -p 8080:8080 --rm -v $PWD/examples:/var/lib/bootcfg:Z -v $PWD/examples/groups/etcd-docker:/var/lib/bootcfg/groups:Z coreos/bootcfg:latest -address=0.0.0.0:8080 -log-level=debug
+    sudo docker run -p 8080:8080 --rm -v $PWD/examples:/var/lib/bootcfg:Z -v $PWD/examples/groups/etcd-docker:/var/lib/bootcfg/groups:Z coreos/bootcfg:latest -address=0.0.0.0:8080 -log-level=debug
+
+## Dependencies
+
+Project dependencies are commited to the `vendor` directory, so Go 1.6+ users can clone to their `GOPATH` and build or test immediately. Go 1.5 users should set `GO15VENDOREXPERIMENT=1`.
+
+Project developers should use [glide](https://github.com/Masterminds/glide) to manage commited dependencies under `vendor`. Configure `glide.yaml` as desired. Use `glide update` to download and update dependencies listed in `glide.yaml` into `/vendor` (do **not** use glide `get`).
+
+    glide update --update-vendored --strip-vendor --strip-vcs
+
+Recursive dependencies are also vendored. A `glide.lock` will be created to represent the exact versions of each dependency.
+
+With an empty `vendor` directory, you can install the `glide.lock` dependencies.
+
+    rm -rf vendor/
+    glide install --strip-vendor --strip-vcs

glide.yaml

@@ -0,0 +1,77 @@
+package: github.com/coreos/coreos-baremetal
+import:
+- package: github.com/alecthomas/units
+  version: 2efee857e7cfd4f3d0138cc3cbb1b4966962b93a
+- package: github.com/camlistore/camlistore
+  version: 9106ce829629773474c689b34aacd7d3aaa99426
+- package: github.com/coreos/coreos-cloudinit
+  version: b3f805dee6a4aa5ed298a1f370284df470eecf43
+  subpackages:
+  - Godeps/_workspace/src/github.com/coreos/yaml
+  - config
+- package: github.com/coreos/go-semver
+  version: 294930c1e79c64e7dbe360054274fdad492c8cf5
+  subpackages:
+  - semver
+- package: github.com/coreos/go-systemd
+  version: 7b2428fec40033549c68f54e26e89e7ca9a9ce31
+  subpackages:
+  - journal
+- package: github.com/coreos/ignition
+  version: 44c274ab414294a8e34b3a940e0ec1afe6b6c610
+  subpackages:
+  - config
+  - config/types
+  - config/v1
+  - config/v1/types
+- package: github.com/coreos/pkg
+  version: 66fe44ad037ccb80329115cb4db0dbe8e9beb03a
+  subpackages:
+  - capnslog
+  - flagutil
+- package: github.com/davecgh/go-spew
+  version: 5215b55f46b2b919f50a1df0eaa5886afe4e3b3d
+  subpackages:
+  - spew
+- package: github.com/golang/protobuf
+  version: f0a097ddac24fb00e07d2ac17f8671423f3ea47c
+  subpackages:
+  - proto
+- package: github.com/pmezard/go-difflib
+  version: 792786c7400a136282c1664665ae0a8db921c6c2
+  subpackages:
+  - difflib
+- package: github.com/spf13/cobra
+  version: 65a708cee0a4424f4e353d031ce440643e312f92
+- package: github.com/spf13/pflag
+  version: 7f60f83a2c81bc3c3c0d5297f61ddfa68da9d3b7
+- package: github.com/stretchr/testify
+  version: 1f4a1643a57e798696635ea4c126e9127adb7d3c
+  subpackages:
+  - assert
+- package: github.com/vincent-petithory/dataurl
+  version: 9a301d65acbb728fcc3ace14f45f511a4cfeea9c
+- package: go4.org
+  version: 03efcb870d84809319ea509714dd6d19a1498483
+  subpackages:
+  - errorutil
+- package: golang.org/x/crypto
+  version: 5dc8cb4b8a8eb076cbb5a06bc3b8682c15bdbbd3
+  subpackages:
+  - cast5
+  - openpgp
+- package: golang.org/x/net
+  version: fb93926129b8ec0056f2f458b1f519654814edf0
+  subpackages:
+  - context
+  - http2
+  - internal/timeseries
+  - trace
+- package: google.golang.org/grpc
+  version: 8eeecf2291de9d171d0b1392a27ff3975679f4f5
+  subpackages:
+  - codes
+- package: gopkg.in/yaml.v2
+  version: f7716cbe52baa25d2e9b0d0da546fcf909fc16b4
+- package: github.com/coreos/yaml
+  version: 6b16a5714269b2f70720a45406b1babd947a17ef