Reduce indirection in Service lock map

• as std::map never invalidates pointers to values, there is no need to use std::unique_ptr<Mutex_t> instead of plain Mutex_t as value

• [2017-11-29 09:42] Validation started with lhcb-gaudi-merge#330
• [2017-11-30 00:03] 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 00:04] Validation started with lhcb-gaudi-head#1682
• [2017-12-07 00:04] Validation started with lhcb-gaudi-head#1683
• [2017-12-08 00:05] 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 00:03] 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 code cleanup labels

assigned to @clemenci

merged

mentioned in commit 50b41a45

removed C++ framework label