uts: Set default hostname to "localhost", rather than "(none)"

The "hostname" tool falls back to setting the hostname to "localhost" if /etc/hostname does not exist. Distribution init scripts have the same fallback. However, if userspace never calls sethostname, such as when booting with init=/bin/sh, or otherwise booting a minimal system without the usual init scripts, the default hostname of "(none)" remains, unhelpfully appearing in various places such as prompts ("root@(none):~#") and logs. Furthrmore, "(none)" doesn't typically resolve to anything useful, while "localhost" does.

Change the default hostname to "localhost". This removes the need for the standard fallback, provides a useful default for systems that never call sethostname, and makes minimal systems that much more useful with less configuration.

---

Looked at "(none)" one too many times, and figured I ought to *do* something about it.

 include/linux/uts.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index 73eb1ed..610bec2 100644
@@ -9,7 +9,7 @@
 #endif
 
 #ifndef UTS_NODENAME
-#define UTS_NODENAME "(none)"	/* set by sethostname() */
+#define UTS_NODENAME "localhost"	/* set by sethostname() */
 #endif
 
 #ifndef UTS_DOMAINNAME

1.7.4.1