#729 hostname sanity check

[Thomas Naughton]

There are big configuration problems if the value of
hostname doesn't match the IP address associated with
the value passed to 'install_cluster'. I think we
should add a very basic heuristic to check
that the value of hostname matches the value of the
ethX's IP address.

Example, see attachedk perl script for a basic idea.

[Thomas Naughton]

quick example to show basic heuristic/idea

[John]

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Looks like the most common problem is people assigning the
same name to both interfaces. Not sure why they do that, but
thats seems to be what happens.

[Bernard Li]

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Can we fast-track this bugfix? I'm having issues with the
SGE package as well.

We can probably add the sanity check to oscar_wizard -
asking the user to make sure that the correct entry of the
host's ip is in /etc/hosts - but what if the ip is assigned
via DHCP? Or do we just not support it.

[Thomas Naughton]

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I'm swamped right now but the code I attached should get
most of the trick, probably needs to be beat on a bit to
make sure there are no stupid corner cases.

I believe it would go in 'install_cluster' and check/print
warning there. I'll try to look at this later this week
when I get to oscar-head (still off living in branches and
branches of branches :( )