gitignore: ignore ctags file

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
[thaller@redhat.com: change to ignore /tags only on top-level]
Signed-off-by: Thomas Haller <thaller@redhat.com>
doc/core: reply message should send from kernel to app

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: Thomas Haller <thaller@redhat.com>
gitignore: ignore patch files

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: Thomas Haller <thaller@redhat.com>