Imports of grpclb_fallback command

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
flagPackage flag implements command-line flag parsing.
golang.org/x/sys/unix
google.golang.org/grpcPackage grpc implements an RPC system called gRPC.
google.golang.org/grpc/balancer/grpclbPackage grpclb defines a grpclb balancer.
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.
google.golang.org/grpc/credentials/altsPackage alts implements the ALTS credential support by gRPC library, which encapsulates all the state needed by a client to authenticate with a server using ALTS and make various assertions, e.g., about the client's identity, role, or whether it is authorized to make a particular call.
google.golang.org/grpc/credentials/googlePackage google defines credentials for google cloud services.
google.golang.org/grpc/interop/grpc_testing
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.
osPackage os provides a platform-independent interface to operating system functionality.
os/execPackage exec runs external commands.
syscallPackage syscall contains an interface to the low-level operating system primitives.
timePackage time provides functionality for measuring and displaying time.