sherpa2: add a missing depenency on OpenSSL

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>
Merge pull request #519 from davidlt/sherpa2-add-dep-on-openssl-libcrypto

sherpa2: add a missing depenency on OpenSSL
Merge remote branch 'origin/IB/CMSSW_7_1_X/stable' into IB/CMSSW_7_0_X/stable