Remove use of the temporary Kernel/TemplatedGenVector LHCb package.

Instead use the ROOT sources directly, as available in the 6.10.x series.

Based on LHCb!899 (merged)

• [2017-09-27 00:13] Validation started with lhcb-gaudi-head#1608
• [2017-09-28 00:06] Validation started with lhcb-gaudi-head#1609
• [2017-09-29 00:05] Validation started with lhcb-gaudi-head#1610
• [2017-09-30 00:07] Validation started with lhcb-gaudi-head#1611
• [2017-10-01 00:07] Validation started with lhcb-gaudi-head#1612
• [2017-10-02 00:06] Validation started with lhcb-gaudi-head#1613
• [2017-10-03 00:05] Validation started with lhcb-gaudi-head#1614
• [2017-10-03 20:50] Validation started with lhcb-gaudi-merge#220
• [2017-10-03 21:21] Validation started with lhcb-gaudi-merge#221
• [2017-10-04 00:05] Validation started with lhcb-clang-test#725
• [2017-10-04 00:06] Validation started with lhcb-gaudi-head-noavx2#132
• [2017-10-04 00:06] Validation started with lhcb-gaudi-head-noavx#151
• [2017-10-04 00:06] Validation started with lhcb-head#1617
• [2017-10-04 00:06] Validation started with lhcb-lcg-dev4#301
• [2017-10-04 00:06] Validation started with lhcb-gaudi-head#1615
• [2017-10-04 00:06] Validation started with lhcb-lcg-dev3#301

unmarked as a Work In Progress

changed title from WIP : Remove use of the temporary Kernel/TemplatedGenVector LHCb package. to Remove use of the temporary Kernel/TemplatedGenVector LHCb package.

changed the description

merged

mentioned in commit 7ec7f67e