LU-5013 llite: add LL_LEASE_{RD,WR,UN}LCK

LU-5013 llite: add LL_LEASE_{RD,WR,UN}LCK

Define new constants LL_LEASE_{RD,WR,UN}LCK for use as the argument to
and return value from the LL_IOC_{GET,SET}_LEASE ioctls. As arguments,
these contants replace the use of F_{RD,WR,UN}LCK from fcntl.h. As
return values they replace the use of FMODE_{READ,WRITE} which are
internal to the Linux kernel source and not under the control of the
Lustre ioctl interface.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I2643d7c548f84dd91cd2855894bf22f94fd20e98
Reviewed-on: http://review.whamcloud.com/10233
Tested-by: Jenkins
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>