clone.sh: Don't print mouthful "You are in 'detached HEAD' state" message

Also, cut down on number of empty lines printed. All this is to not take so
much space in the build log, as cloning is usually not the most interesting
part of it.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I35f47ac9af0b0fe20475f21f00f934eb7a9daa69
1 file changed