We should not return an "installation success" message if installation failed because disk is full

Build 1.6.0a-24 for RHEL 64-bit

http://builds.hq.northscale.net/latestbuilds/northscale_server_rhel_5.4_x86_64_1.6.0a-24-gc02d795.tar.gz

on CentOS 5.2 in EC2

STEPS:
1. disk is too full to allow for installation of membase
2. install

ACTUAL RESULT:
find: write error: No space left on device

You have successfully installed NorthScale Server.
Please browse to http://domU-12-31-39-18-36-10:8080/ to configure your server.
Please refer to http://northscale.com/support for
additional resources.

Please note that you have to update your firewall configuration to
allow connections to the following ports: 11211, 11210, 4369, 8080
and from 21100 to 21199.

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See /opt/NorthScale/LICENSE.txt.