LU-10418 flr: replace llapi_lease_get with llapi_lease_acquire

LU-10418 flr: replace llapi_lease_get with llapi_lease_acquire

After commit 8f1c7c1e44a4cc8870eb2b2a71da323e265881b4 landed,
we need replace llapi_lease_{get,put} with llapi_lease_{acquire,release}.

Change-Id: Ie36abeb3c71f2d0c3345de9b4830549af3bb56a3
Test-Parameters: trivial testlist=sanity-flr
Signed-off-by: Jian Yu <jian.yu@intel.com>
Reviewed-on: https://review.whamcloud.com/31221
Tested-by: Jenkins
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>