Imports of trillian_log_signer 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/go-sql-driver/mysqlPackage mysql provides a MySQL driver for Go's database/sql package.
github.com/golang/glogPackage glog implements logging analogous to the Google-internal C++ INFO/ERROR/V setup.
github.com/google/trillian/cmdPackage cmd contains common code for the various binaries in this repository.
github.com/google/trillian/crypto/keys/der/proto
github.com/google/trillian/crypto/keys/pem/proto
github.com/google/trillian/crypto/keys/pkcs11/proto
github.com/google/trillian/extensionPackage extension provides an extension mechanism for Trillian code to access fork-specific functionality.
github.com/google/trillian/logPackage log holds the code that is specific to Trillian logs core operation, particularly the code for sequencing.
github.com/google/trillian/merkle/objhasher
github.com/google/trillian/merkle/rfc6962
github.com/google/trillian/monitoring/prometheusPackage prometheus provides a Prometheus-based implementation of the MetricFactory abstraction.
github.com/google/trillian/serverPackage server contains the Trillian log server implementation.
github.com/google/trillian/storage/mysqlPackage mysql provides a MySQL-based storage layer implementation.
github.com/google/trillian/utilPackage util holds utility functions.
github.com/google/trillian/util/etcd
github.com/prometheus/client_golang/prometheus/promhttpPackage promhttp provides tooling around HTTP servers and clients.
golang.org/x/net/contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
net/httpPackage http provides HTTP client and server implementations.
osPackage os provides a platform-independent interface to operating system functionality.
timePackage time provides functionality for measuring and displaying time.