[packages] update .gitignore file

Signed-off-by: Luka Perkov <luka@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/packages@38176 3c298f89-4303-0410-b956-a3cf2f4a3e73
[packages] lxc: bump to latest git version

Signed-off-by: Luka Perkov <luka@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/packages@38177 3c298f89-4303-0410-b956-a3cf2f4a3e73