Remove unreferenced code

• [2018-04-13 17:38] Validation started with lhcb-gaudi-merge#484
• [2018-04-14 00:02] Validation started with lhcb-lcg-dev3#494
• [2018-04-14 00:03] Validation started with lhcb-lcg-dev4#494
• [2018-04-14 00:03] Validation started with lhcb-gaudi-head-py3#123
• [2018-04-14 00:06] Validation started with lhcb-tdr-test#119
• [2018-04-14 00:09] Validation started with lhcb-gaudi-head#1833
• [2018-04-14 01:26] Validation started with lhcb-gaudi-head#1833
• [2018-04-14 16:11] Validation started with lhcb-gaudi-head#1834
• [2018-04-15 00:03] Validation started with lhcb-lcg-dev3#495
• [2018-04-15 00:04] Validation started with lhcb-gaudi-head-py3#124
• [2018-04-15 00:04] Validation started with lhcb-lcg-dev4#495
• [2018-04-15 00:07] Validation started with lhcb-tdr-test#120
• [2018-04-15 00:09] Validation started with lhcb-gaudi-head#1835
• [2018-04-16 00:03] Validation started with lhcb-lcg-dev4#496
• [2018-04-16 00:03] Validation started with lhcb-gaudi-head-py3#125
• [2018-04-16 00:04] Validation started with lhcb-lcg-dev3#496
• [2018-04-16 00:05] Validation started with lhcb-tdr-test#121
• [2018-04-16 00:07] Validation started with lhcb-gaudi-head#1836

approved this merge request

assigned to @clemenci

changed milestone to %v30r3

added code cleanup label

merged

mentioned in commit 5b7d3482