Fixed #5112 - Launchd Service broke in 2.6.2 with OS X 10.4 Clients.

Just to follow up on 5112 I have a dirty patch that appears to work.
Nominally tested it on 10.4, 10.5, & 10.6. 10.4 now applies catalogs
instead of failing. All versions successfully manage a test services
state as well.

Does anyone have a better suggestion than '-o /dev/stdout'? Seems a
mite hacky to me.

Also I think that the 10.4 machines are going to a have a \ ( slash )
file in whatever puppets working dir was. plutil seems to have been
interpreting as literal file name.