LU-5604 tests: fix usage of drop_ldlm_reply() in tests

LU-5604 tests: fix usage of drop_ldlm_reply() in tests

The OBD_FAIL_LDLM_REPLY is not used to drop replies on MDT,
OST and MGS anymore. But it is still used in some tests
via drop_ldlm_reply() wrapper.

Patch renames drop_ldlm_reply() to the drop_mdt_ldlm_reply()
since it was used only for MDT. Tests were fixed also to use
MDT-specific OBD_FAIL_MDS_REPLY_NET code.
recovery-small.sh: test_53, test_66, test_113 and test_133
replay-dual.sh: test_19
replay-single.sh: test_73b

Test 66 in recovery-small also was fixed to be aware of DNE.
Tests 66 and 10c in recovery-small.sh were fixed to use
'conn_uuid' param instead of 'mds_conn_uuid' which doesn't
exists now.

Signed-off-by: Mikhail Pershin <mike.pershin@intel.com>
Change-Id: I90f7410cffcd504b3ff37728df1522693e6115cf
Reviewed-on: https://review.whamcloud.com/16846
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>