selftests: add OFD lock tests

Test the basic locking stuff on 2 fds: multiple read locks,
conflicts between read and write locks, use of len==0 for queries.
Also tests for F_UNLCK F_OFD_GETLK extens

selftests: add OFD lock tests

Test the basic locking stuff on 2 fds: multiple read locks,
conflicts between read and write locks, use of len==0 for queries.
Also tests for F_UNLCK F_OFD_GETLK extension.

[ jlayton: fix unlink() pathname in selftest ]

Cc: Jeff Layton <[email protected]>
Cc: Chuck Lever <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Shuah Khan <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Stas Sergeev <[email protected]>
Signed-off-by: Jeff Layton <[email protected]>

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