[CMSSW_7_0_X] nss-toolfile,nspr-toolfile: remove unused tool files

The following tool files were needed open Cyrus SASL library
used in openldap external. Cyrus SASL library was disabled
in openldap and removed from CMSDIST. Remove unused tool files.

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>