retiolum apply-custom-hosts-patches: initial commit

Custom hosts patches are currently used for "LAN supernodes".

Example patch:
--- destroy	2012-05-12 04:13:57.081041849 +0100
+++ destroy	2013-01-13 18:35:30.087707751 +0100
@@ -1,3 +1,4 @@
+Address = destroy.local
 Subnet = 42:9277:1f1e:7599:ae4b:7cca:b4a3:fe47/128
 Subnet = 10.243.0.31/32
 Compression = 9