LU-1302 llog: llog test update and fixes

LU-1302 llog: llog test update and fixes

- port llog_test fixed from Orion
- remove unneeded include files
- remove llog init/fini from lmv, it is not used
- add new test_7 for llog_test
- add unlink64 handling

Signed-off-by: Mikhail Pershin <tappro@whamcloud.com>
Change-Id: I4793bb02748f2aaab33d67d0f04c8767e7f5ffb9
Reviewed-on: http://review.whamcloud.com/3825
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Hudson
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>