zfs/debian: add packaging files

based on Debian's packaging work, but simplified:
- no DKMS
- no dracut
- no udebs

and remove old patches which were based on top of Debian's packaging.

Reviewed-by: Stoiko Ivanov <s.ivanov@proxmox.com>
Tested-by: Stoiko Ivanov <s.ivanov@proxmox.com>
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

zfs/debian/patches/series

@@ -0,0 +1,12 @@
+0001-Check-for-META-and-DCH-consistency-in-autoconf.patch
+0002-Add-libuutil-to-LIBADD-for-libzfs-and-libzfs_core.patch
+0003-add-man-page-reference-to-systemd-units.patch
+0004-always-load-ZFS-module-on-boot.patch
+0005-fix-install-path-of-zpool.d-scripts.patch
+0006-cmd-python-exec-path.patch
+0007-zed-service-bindir.patch
+0008-increase-default-zcmd-allocation-to-256K.patch
+0009-import-with-d-dev-disk-by-id-in-scan-service.patch
+0010-Fix-deadlock-between-zfs-umount-snapentry_expire.patch
+0011-deadlock-between-mm_sem-and-tx-assign-in-zfs_write-a.patch
+0012-enable-zed.patch