Imports of package credentials

PathSynopsis
github.com/docker/cli/cli/config/types
github.com/docker/docker-credential-helpers/client
github.com/docker/docker-credential-helpers/credentials
netPackage net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets.
net/urlPackage url parses URLs and implements query escaping.
os/execPackage exec runs external commands.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.