AutoYaST: write /etc/hosts even if keep_install_network=true (bnc#796…

…580)

The regression was introduced in SP2 in yast2-network-2.17.166
(2012-01-13) in a fix for bnc#712864.
4f67f62
There, a Lan::Read(`cache) call is added with the intent to merge in the
config provided by linuxrc; it also calls Host::Read, which should
always cache, but wrongly discards the Host::Import'ed data. So a later
Host::Write call thinks there is nothing new to write.
(y2log: "Host.ycp:153 Hosts not modified")

This is an incomplete fix for early testing. It should work
but leaves the code messy: `modified`, `initialized` and
`hosts_init` should all be merged.

src/modules/Host.ycp

@@ -199,7 +199,8 @@ global define boolean Write() {
  * @return true if success
  */
 global define boolean Import(map settings) {
-    modified = true;
+    modified = true;            // trigger Write
+    initialized = true;         // don't let Read discard our data
 
     hosts = eval(settings["hosts"]:$[]);