bisect: implement "read_bisect_paths" to read paths in "$GIT_DIR/BISECT_NAMES"
bisect: implement "read_bisect_paths" to read paths in "$GIT_DIR/BISECT_NAMES"

This is needed because  "git bisect--helper" must read bisect paths
in "$GIT_DIR/BISECT_NAMES", so that a bisection can be performed only
on commits that touches paths in this file.

Signed-off-by: Christian Couder <ddbaab5867ed34fd53535b58c9cdd59abd2e2aff@tuxfamily.org>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git