ACCUMULO-1598 Fixes RFlile unit tests

The RFile tests had several tests in the @Ignore state.  Many
of these were redundant, so I simply excise them.  There were
a couple of missing files from the repository that the tests
needed; this patch adds them.

Signed-off-by: John Vines <jvines@gmail.com>
ACCUMULO-1614 added conditional writer randomwalk test