Use tagged versions for dependencies where possible

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor.conf

@@ -1,6 +1,6 @@
 github.com/beorn7/perks 4c0e84591b9aa9e6dcfdf3e020114cd81f89d5f9
 github.com/blang/semver v3.1.0
-github.com/boltdb/bolt e9cf4fae01b5a8ff89d0ec6b32f0d9c9f79aefdd
+github.com/boltdb/bolt v1.3.1
 github.com/BurntSushi/toml a368813c5e648fee92e5f6c30e3944ff9d5e8895
 github.com/containerd/cgroups 5e610833b72089b37d0e615de9a92dfc043757c2
 github.com/containerd/console 4d8a41f4ce5b9bae77c41786ea2458330f43f081
@@ -13,7 +13,7 @@ github.com/containerd/ttrpc 94dde388801693c54f88a6596f713b51a8b30b2d
 github.com/containerd/typeurl a93fcdb778cd272c6e9b3028b2f42d813e785d40
 github.com/containernetworking/cni v0.6.0
 github.com/containernetworking/plugins v0.7.0
-github.com/coreos/go-systemd 48702e0da86bd25e76cfef347e2adeb434a0d0a6
+github.com/coreos/go-systemd v14
 github.com/davecgh/go-spew v1.1.0
 github.com/docker/distribution b38e5838b7b2f2ad48e06ec4b500011976080621
 github.com/docker/docker 86f080cff0914e9694068ed78d503701667c4c00
@@ -21,23 +21,23 @@ github.com/docker/go-events 9461782956ad83b30282bf90e31fa6a70c255ba9
 github.com/docker/go-metrics 4ea375f7759c82740c893fc030bc37088d2ec098
 github.com/docker/go-units v0.3.1
 github.com/docker/spdystream 449fdfce4d962303d702fec724ef0ad181c92528
-github.com/emicklei/go-restful ff4f55a206334ef123e4f79bbf348980da81ca46
-github.com/ghodss/yaml 73d445a93680fa1a78ae23a5839bad48f32ba1ee
-github.com/godbus/dbus c7fdd8b5cd55e87b4e1f4e372cdb1db61dd6c66f
+github.com/emicklei/go-restful v2.2.1
+github.com/ghodss/yaml v1.0.0
+github.com/godbus/dbus v3
 github.com/gogo/googleapis 08a7655d27152912db7aaf4f983275eaf8d128ef
 github.com/gogo/protobuf v1.0.0
 github.com/golang/glog 44145f04b68cf362d9c4df2182967c2275eaefed
 github.com/golang/protobuf v1.1.0
 github.com/google/gofuzz 44d81051d367757e1c7c6a5a86423ece9afcf63c
-github.com/grpc-ecosystem/go-grpc-prometheus 6b7015e65d366bf3f19b2b2a000a831940f0f7e0
+github.com/grpc-ecosystem/go-grpc-prometheus v1.1
 github.com/hashicorp/errwrap 7554cd9344cec97297fa6649b055a8c98c2a1e55
 github.com/hashicorp/go-multierror ed905158d87462226a13fe39ddf685ea65f1c11f
-github.com/json-iterator/go f2b4162afba35581b6d4a50d3b8f34e33c144682
+github.com/json-iterator/go 1.1.5
 github.com/matttproud/golang_protobuf_extensions v1.0.0
 github.com/Microsoft/go-winio v0.4.7
 github.com/Microsoft/hcsshim v0.6.11
 github.com/modern-go/concurrent 1.0.3
-github.com/modern-go/reflect2 05fbef0ca5da472bbf96c9322b84a53edc03c9fd
+github.com/modern-go/reflect2 1.0.1
 github.com/opencontainers/go-digest c9281466c8b2f606084ac71339773efd177436e7
 github.com/opencontainers/image-spec v1.0.1
 github.com/opencontainers/runc 69663f0bd4b60df09991c08812a60108003fa340
@@ -54,7 +54,7 @@ github.com/seccomp/libseccomp-golang 32f571b70023028bd57d9288c20efbcb237f3ce0
 github.com/sirupsen/logrus v1.0.0
 github.com/stretchr/testify v1.1.4
 github.com/syndtr/gocapability db04d3cc01c8b54962a58ec7e491717d06cfcc16
-github.com/tchap/go-patricia 5ad6cdb7538b0097d5598c7e57f0a24072adf7dc
+github.com/tchap/go-patricia v2.2.6
 github.com/urfave/cli 7bc6a0acffa589f415f88aca16cc1de5ffd66f9c
 github.com/xeipuuv/gojsonpointer 4e3ac2762d5f479393488629ee9370b50873b3a6
 github.com/xeipuuv/gojsonreference bd5ef7bd5415a7ac448318e64f11a24cd21e594b