Disable sending of histograms by the MonitorSvc in HLT2.

Disable sending of HLT2 histograms by the MonitorSvc to avoid peaks in the farm dead time every hour. Also increase the interval to 10 days for good measure.

cc @clara @jost @cofitzpa @mramospe

• [2018-05-05 00:45] Validation started with lhcb-gaudi-head-py3#144
• [2018-05-05 00:51] Validation started with lhcb-lcg-dev4#515
• [2018-05-05 00:53] Validation started with lhcb-clang-test#942
• [2018-05-05 00:53] Validation started with lhcb-head#1842
• [2018-05-05 00:59] Validation started with lhcb-moore-test#47
• [2018-05-05 01:00] Validation started with lhcb-lcg-dev3#515
• [2018-05-05 01:05] Validation started with lhcb-tdr-test#141
• [2018-05-05 01:56] Validation started with lhcb-2018-patches#203
• [2018-05-05 02:20] Validation started with lhcb-gaudi-head#1857
• [2018-05-05 08:59] Validation started with lhcb-gaudi-merge#506
• [2018-05-05 12:21] Validation started with lhcb-gaudi-merge#507
• [2018-05-05 13:07] Validation started with lhcb-gaudi-merge#508
• [2018-05-05 13:08] Validation started with lhcb-gaudi-merge#509

This fix is already installed at the pit. There is no more hourly dead time.

merged

mentioned in commit 1fbf79d1

changed milestone to %v28r2p1