Imports of notary-signer command

PathSynopsis
crypto/tlsPackage tls partially implements TLS 1.2, as specified in RFC 5246, and TLS 1.3, as specified in RFC 8446.
errorsPackage errors implements functions to manipulate errors.
expvarPackage expvar provides a standardized interface to public variables, such as operation counters in servers.
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/distribution/healthPackage health provides a generic health checking framework.
github.com/docker/go-connections/tlsconfigPackage tlsconfig provides primitives to retrieve secure-enough TLS configurations for both clients and servers.
github.com/docker/notary
github.com/docker/notary/cryptoservice
github.com/docker/notary/passphrase
github.com/docker/notary/proto
github.com/docker/notary/signer
github.com/docker/notary/signer/api
github.com/docker/notary/signer/keydbstore
github.com/docker/notary/storage
github.com/docker/notary/storage/rethinkdb
github.com/docker/notary/trustmanager
github.com/docker/notary/tuf/data
github.com/docker/notary/tuf/signed
github.com/docker/notary/tuf/utils
github.com/docker/notary/utils
github.com/docker/notary/version
github.com/go-sql-driver/mysqlPackage mysql provides a MySQL driver for Go's database/sql package.
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.
gopkg.in/dancannon/gorethink.v3
logPackage log implements a simple logging package.
netPackage net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets.
net/httpPackage http provides HTTP client and server implementations.
osPackage os provides a platform-independent interface to operating system functionality.
os/signalPackage signal implements access to incoming signals.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.
timePackage time provides functionality for measuring and displaying time.