Centralize the base rump libraries into a variable used by all the other
Makefiles so that we can make changes to it centrally as needed and have
less mess. Fixes the sun2 build that needs rumpvfs af

Centralize the base rump libraries into a variable used by all the other
Makefiles so that we can make changes to it centrally as needed and have
less mess. Fixes the sun2 build that needs rumpvfs after librump after
the latest changes.

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Fix static linking for the tests: -lrump is also used by -lrumpuser,
so we also need -lrump after -lrumpuser. Fixes build for sun2.

Move basic unionfs test from fs/union to fs/vfs and make it test
all whiteout-supporting file systems with the file system in question
as the upper layer. Also, add an unlink to the test to see if
w

Move basic unionfs test from fs/union to fs/vfs and make it test
all whiteout-supporting file systems with the file system in question
as the upper layer. Also, add an unlink to the test to see if
whiteouts are really working.

ffslog_basic is the test case for PR kern/44377

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xfail test for problem described in PR kern/23986

Add basic union test.