system/drbd-kernel: Added (split from system/drbd).

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+drbd-kernel (Kernel Module for Distributed Replicated Block Device)
+
+DRBD is a block device which is designed to build high availability clusters. 
+This is done by mirroring a whole block device via (a dedicated) network. 
+You could see it as a network RAID1. DRBD takes over the data, writes it to 
+the local disk and sends it to the other host. On the other host, it takes it 
+to the disk there.
+
+Starting with Linux 2.6.33, DRBD is officially integrated into the vanilla 
+Linux kernel source. Besides the kernel integration, DRBD continues to be 
+developed out of tree.
+
+If you have a 2.6.33 kernel, you should use the DRBD module shipped with 
+your kernel, or compile it from your kernel sources if it is not available 
+in your current configuration.
+
+If you have an earlier kernel version then DRBD can be built as a module, 
+or it can be patched into the kernel. This build creates a kernel module 
+based on your current kernel using /lib/modules/$(uname -r)/build as the 
+kernel source tree. This may not be appropriate for you and you may need to 
+edit either KERNEL (uname -r) or KERNELPATH (/lib/modules/2.6.x-foo/build) 
+environment variable to point to the correct source or headers.