#1 Remove default avalon repository locations

[Paul Cooley]

Currently, the RaistlinContainer, if missing the
kernel.xml file, attempts to download dependencies from
the Ibiblio and DPML sites. While provides pessimistic
configuration, the reliance upon the bandwidth-poor
sites masks configuration difficulties that may occur
in the future.

Instead of the Kernel attempting to use the default,
the Raistlin Kernel should fail if its repository
location is NOT explicitly set.

In addition, the kernel.xml file should be required for
kernel start in order to ensure that
deployers/developers/users fulfill this step.