Adding CSA14 GTs and enabling pre-mixing in autoCond.py

Updates autoCond.py by adding the GTs for the pessimistic scenario (aka 50 ns) in CSA14, and changing the GT for the optimistic scenario (aka 25 ns) in CSA14.
- POSTLS170_V6 GT
 - updated AlCa conditions for the 50 ns CSA14 scenario
 - technical fixes (a.k.a. migrations of the accounts in prod)
 - enabling Ecal full readout for pre-mixing
 - adding SiStrip offsets for APV cycle phase producers.
- POSTLS170_V7 GT
 - enabling Ecal full readout for pre-mixing
 - adding SiStrip offsets for APV cycle phase producers.