Fix clang 5.0 warnings

This simply fixes the warnings we see when building Gaudi with clang 5.0.

• [2017-11-24 17:56] Validation started with lhcb-gaudi-merge#323
• [2017-11-25 00:03] Validation started with lhcb-gaudi-head#1669
• [2017-11-25 00:03] Validation started with lhcb-future-clang#386
• [2017-11-26 00:03] Validation started with lhcb-future#613
• [2017-11-26 00:03] Validation started with lhcb-future-clang#387
• [2017-11-26 00:03] Validation started with lhcb-gaudi-head#1670
• [2017-11-27 00:04] Validation started with lhcb-gaudi-head#1671
• [2017-11-27 00:04] Validation started with lhcb-future#614
• [2017-11-27 00:04] Validation started with lhcb-future-clang#388
• [2017-11-27 12:43] Validation started with lhcb-gaudi-head#1672
• [2017-11-27 15:24] Validation started with lhcb-gaudi-head#1672
• [2017-11-28 00:03] Validation started with lhcb-future#615
• [2017-11-28 00:04] Validation started with lhcb-gaudi-head#1673
• [2017-11-28 00:04] Validation started with lhcb-future-clang#389
• [2017-11-28 12:25] Validation started with lhcb-gaudi-head#1674
• [2017-11-29 00:02] Validation started with lhcb-future#616
• [2017-11-29 00:03] Validation started with lhcb-future-clang#390
• [2017-11-30 00:02] Validation started with lhcb-future#617
• [2017-11-30 00:03] Validation started with lhcb-future-clang#391
• [2017-11-30 00:04] Validation started with lhcb-gaudi-head#1676
• [2017-12-01 00:03] Validation started with lhcb-gaudi-head#1677
• [2017-12-02 00:04] Validation started with lhcb-gaudi-head#1678
• [2017-12-03 00:04] Validation started with lhcb-gaudi-head#1679
• [2017-12-04 00:03] Validation started with lhcb-gaudi-head#1680
• [2017-12-04 10:31] Validation started with prepare-gaudi-420#10
• [2017-12-05 00:03] Validation started with lhcb-gaudi-head#1681
• [2017-12-06 00:03] Validation started with lhcb-gaudi-head#1682
• [2017-12-07 00:04] Validation started with lhcb-gaudi-head#1683
• [2017-12-08 00:04] Validation started with lhcb-gaudi-head#1684
• [2017-12-08 09:08] Validation started with lhcb-gaudi-head#1684
• [2017-12-09 00:04] Validation started with lhcb-gaudi-head#1685
• [2017-12-10 00:03] Validation started with lhcb-gaudi-head#1686
• [2017-12-11 00:03] Validation started with lhcb-gaudi-head#1687
• [2017-12-12 00:04] Validation started with lhcb-gaudi-head#1688
• [2017-12-12 15:19] Validation started with lhcb-gaudi-head-py3#1
• [2017-12-13 00:03] Validation started with lhcb-gaudi-head#1689
• [2017-12-13 00:04] Validation started with lhcb-gaudi-head-py3#2
• [2017-12-14 00:03] Validation started with lhcb-gaudi-head#1690
• [2017-12-14 00:30] Validation started with lhcb-gaudi-head-py3#3
• [2017-12-14 00:55] Validation started with lhcb-gaudi-head#1690
• [2017-12-15 00:02] Validation started with lhcb-gaudi-head-py3#4
• [2017-12-15 00:04] Validation started with lhcb-gaudi-head#1691
• [2017-12-16 00:03] Validation started with lhcb-gaudi-head-py3#5
• [2017-12-16 00:03] Validation started with lhcb-gaudi-head#1692
• [2017-12-17 00:03] Validation started with lhcb-gaudi-head-py3#6
• [2017-12-17 00:04] Validation started with lhcb-gaudi-head#1693
• [2017-12-18 00:03] Validation started with lhcb-gaudi-head#1694
• [2017-12-18 00:04] Validation started with lhcb-gaudi-head-py3#7
• [2017-12-18 12:29] Validation started with lhcb-gaudi-head#1695

approved this merge request

changed milestone to %v30r1

added C++ framework label

assigned to @clemenci

merged

mentioned in commit 3ed25bf3

added code cleanup label

removed C++ framework label