add targetcli command dispatcher class
add targetcli command dispatcher class

Add a helper class to launch a targetcli process and feed it multiple
commands via stdin. This significantly speeds up multi-cmd execution.

Signed-off-by: David Disseldorp <589a549dc9f982d9f46aeeb82a09ab6d87ccf1d8@suse.de>

SUSE/lrbd,swiftgist/lrbd