Replace godep with vndr

Vndr has a simpler configuration and allows pointing to forked
packages. Additionally other docker projects are now using
vndr making vendoring in distribution more consistent.

Updates letsencrypt to use fork.
No longer uses sub-vendored packages.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)

vendor/golang.org/x/crypto/bcrypt/bcrypt.go

@@ -4,7 +4,7 @@
 
 // Package bcrypt implements Provos and Mazières's bcrypt adaptive hashing
 // algorithm. See http://www.usenix.org/event/usenix99/provos/provos.pdf
-package bcrypt
+package bcrypt // import "golang.org/x/crypto/bcrypt"
 
 // The code is a port of Provos and Mazières's C implementation.
 import (

vendor/golang.org/x/crypto/blowfish/cipher.go

@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // Package blowfish implements Bruce Schneier's Blowfish encryption algorithm.
-package blowfish
+package blowfish // import "golang.org/x/crypto/blowfish"
 
 // The code is a port of Bruce Schneier's C implementation.
 // See http://www.schneier.com/blowfish.html.

vendor/golang.org/x/crypto/ocsp/ocsp.go

@@ -5,7 +5,7 @@
 // Package ocsp parses OCSP responses as specified in RFC 2560. OCSP responses
 // are signed messages attesting to the validity of a certificate for a small
 // period of time. This is used to manage revocation for X.509 certificates.
-package ocsp
+package ocsp // import "golang.org/x/crypto/ocsp"
 
 import (
 	"crypto"