Imports of escrow command

PathSynopsis
flagPackage flag implements command-line flag parsing.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/Sirupsen/logrus
github.com/docker/notary
github.com/docker/notary/storage
github.com/docker/notary/trustmanager
github.com/docker/notary/trustmanager/remoteks
github.com/docker/notary/utils
github.com/spf13/viper
google.golang.org/grpcPackage grpc implements an RPC system called gRPC.
google.golang.org/grpc/credentialsPackage credentials implements various credentials supported by gRPC library, which encapsulate all the state needed by a client to authenticate with a server and make various assertions, e.g., about the client's identity, role, or whether it is authorized to make a particular call.
netPackage net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets.