Reverted old default behaviour of CondDBUI.Admin.MakeDBFromFiles

Also in 2018-patches, see merge request !1269 (merged)

(cherry picked from commit 1a23fe29)

• [2018-04-24 09:32] Validation started with lhcb-head#1829
• [2018-04-24 11:03] Validation started with lhcb-head#1829
• [2018-04-24 17:40] Validation started with lhcb-gaudi-merge#496
• [2018-04-25 00:10] Validation started with lhcb-lcg-dev4#505
• [2018-04-25 00:10] Validation started with lhcb-lcg-dev3#505
• [2018-04-25 00:11] Validation started with lhcb-clang-test#932
• [2018-04-25 00:11] Validation started with lhcb-gaudi-head-py3#134
• [2018-04-25 00:12] Validation started with lhcb-head#1830
• [2018-04-25 00:15] Validation started with lhcb-tdr-test#131
• [2018-04-25 00:15] Validation started with lhcb-gaudi-head#1846

merged

mentioned in commit 2f0f6d1f