Imports of devapps command

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
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/AzureAD/microsoft-authentication-library-for-go/apps/cachePackage cache allows third parties to implement external storage for caching token data for distributed systems or multiple local applications access.
github.com/AzureAD/microsoft-authentication-library-for-go/apps/publicPackage public provides a client for authentication of "public" applications.
io/ioutilPackage ioutil implements some I/O utility functions.
logPackage log implements a simple logging package.
osPackage os provides a platform-independent interface to operating system functionality.
timePackage time provides functionality for measuring and displaying time.