Imports of package util

PathSynopsis
encoding/jsonPackage json implements encoding and decoding of JSON as defined in RFC 7159.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/coreos/etcd/clientPackage client provides bindings for the etcd APIs.
io/ioutilPackage ioutil implements some I/O utility functions.
net/httpPackage http provides HTTP client and server implementations.