Imports of package execdriver

PathSynopsis
errorsPackage errors implements functions to manipulate errors.
github.com/dotcloud/docker/pkg/term
github.com/kr/ptyPackage pty is a wrapper for github.com/creack/pty, which provides functions for working with Unix terminals.
ioPackage io provides basic interfaces to I/O primitives.
osPackage os provides a platform-independent interface to operating system functionality.
os/execPackage exec runs external commands.