b=15556
i=nikita.danilov
i=yury.umanets

- do not produce zero inode number;
- hash VFS inode by FID;
- start FID sequence from 0x100000400.

b=14860

reverting commit (in b14149) about changing SEQ start from 0x100000000.

i=yong.fan
i=rahul.deshmukh
i=nikita.danilov

- use req_capsule interface for client.
- add some interoperability support on server side.

b=14064

- readdir() for liblustre: i=nikita,fanyong
- flock for liblustre and various fixes for liblustre: i=umka,fanyong