#2 Patches enabling Parallel::Forkmanager forking in discover

[Russell Adams]

See attached for patches enabling Parallel::ForkManager
style forking
during devdiscover.

I've tested it on my limited configs, and the output is
identical to
non-forking code. The important thing is that there is
one fork per
outfile and dd object pair so there isn't a need to
share memory.

The per outfile requirement means that each host in the
ddx file must
have its own outfile, and devdiscover must be set to
use bundling
files. I added an option to genddx to create one
filename per host
with an optional prefix (ie: for subdirectories).

[Russell Adams]

Patches for Parallel::ForkManager in discovery.

[Russell Adams]

Adds bundling support to genddx.

[Russell Adams]

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Additional patch for genddx to support bundling with the
--prefix option in previous patch.