mdadm daemon -> off by default?

[Jeff Waugh]

Hey all,

So, we have established that mdadm runs only to provide notification of RAID
b0rkage, which is not necessary in the majority of cases where Ubuntu will
be installed. But it is good to have mdadm in base by default. So, here are
two potential solutions:

 1) change the mdadm default to not start the daemon, users can fix this up
 if they want it running

 2) check /proc/mdstat to see if any raid devices exist, and only run the
 daemon if they do

The first option is an easy way out. The second could introduce bugs, but it
is a pretty simple format to check. I'm tempted to do the second. Let me
know if there's a better way, or if this is an unwise change to make now.

  https://bugzilla.no-name-yet.com/show_bug.cgi?id=966

- Jeff

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