Add glide.yaml and glide.lock for vendoring.

I'm deliberately *not* checking in the vendor/ directory here, because
doing so would interfere with people trying to use the libraries rather
than the binaries. Sadly, none of the vendoring tools work very well when
I ask them to vendorize just cmd/ (they reimport a copy of the libs in
this repository), so for simplicity right now I'll lock the versions with
glide, but users wanting reproducible builds will still need to
`glide install` themselves.

.gitignore

@@ -2,3 +2,4 @@ cmd/pixiecore-apache2/pixiecore-apache2
 cmd/pixiecore/pixiecore
 pcap/pcap.test
 dhcp4/dhcp4.test
+vendor/

glide.lock

@@ -0,0 +1,70 @@
+hash: 03601eebacfd9fcac492ebdfbc1b8ecbe7acc5142ab6f1b0f248c9720f166702
+updated: 2016-08-14T17:40:59.745556939-07:00
+imports:
+- name: github.com/BurntSushi/toml
+  version: 99064174e013895bbd9b025c31100bd1d9b590ca
+- name: github.com/fsnotify/fsnotify
+  version: a8a77c9133d2d6fd8334f3260d06f60e8d80a5fb
+- name: github.com/hashicorp/hcl
+  version: d8c773c4cba11b11539e3d45f93daeaa5dcf1fa1
+  subpackages:
+  - hcl/ast
+  - hcl/parser
+  - hcl/token
+  - json/parser
+  - hcl/scanner
+  - hcl/strconv
+  - json/scanner
+  - json/token
+- name: github.com/inconshreveable/mousetrap
+  version: 76626ae9c91c4f2a10f34cad8ce83ea42c93bb75
+- name: github.com/kr/fs
+  version: 2788f0dbd16903de03cb8186e5c7d97b69ad387b
+- name: github.com/magiconair/properties
+  version: b3f6dd549956e8a61ea4a686a1c02a33d5bdda4b
+- name: github.com/mitchellh/mapstructure
+  version: ca63d7c062ee3c9f34db231e352b60012b4fd0c1
+- name: github.com/pkg/errors
+  version: a22138067af1c4942683050411a841ade67fe1eb
+- name: github.com/pkg/sftp
+  version: a71e8f580e3b622ebff585309160b1cc549ef4d2
+- name: github.com/spf13/afero
+  version: cc9c21814bb945440253108c4d3c65c85aac3c68
+  subpackages:
+  - mem
+  - sftp
+- name: github.com/spf13/cast
+  version: e31f36ffc91a2ba9ddb72a4b6a607ff9b3d3cb63
+- name: github.com/spf13/cobra
+  version: 7c674d9e72017ed25f6d2b5e497a1368086b6a6f
+- name: github.com/spf13/jwalterweatherman
+  version: 33c24e77fb80341fe7130ee7c594256ff08ccc46
+- name: github.com/spf13/pflag
+  version: f676131e2660dc8cd88de99f7486d34aa8172635
+- name: github.com/spf13/viper
+  version: 346299ea79e446ebdddb834371ceba2e5926b732
+- name: golang.org/x/crypto
+  version: a548aac93ed489257b9d959b40fe1e8c1e20778c
+  subpackages:
+  - ssh
+  - curve25519
+  - ed25519
+  - ed25519/internal/edwards25519
+- name: golang.org/x/net
+  version: 07b51741c1d6423d4a6abab1c49940ec09cb1aaf
+  subpackages:
+  - bpf
+  - ipv4
+  - internal/iana
+- name: golang.org/x/sys
+  version: a646d33e2ee3172a661fc09bca23bb4889a41bc8
+  subpackages:
+  - unix
+- name: golang.org/x/text
+  version: 2910a502d2bf9e43193af9d68ca516529614eed3
+  subpackages:
+  - transform
+  - unicode/norm
+- name: gopkg.in/yaml.v2
+  version: e4d366fc3c7938e2958e662b4258c7a89e1f0e3e
+testImports: []

glide.yaml

@@ -0,0 +1,8 @@
+package: go.universe.tf/netboot
+import:
+- package: github.com/spf13/cobra
+- package: github.com/spf13/viper
+- package: golang.org/x/net
+  subpackages:
+  - bpf
+  - ipv4