LU-10862 ldlm: remove trace from ldlm_pool_{count,skrink}()

LU-10862 ldlm: remove trace from ldlm_pool_{count,skrink}()

The trace in ldlm_pool_{count,shrink}() is too noisy given its
information value so remove it.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: Iefed8000368c66b678aeae203e3afed06faa75c4
Test-Parameters: trivial
Reviewed-on: https://review.whamcloud.com/31820
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>