Prepare v28r3 release

• [2018-06-22 00:45] Validation started with lhcb-gaudi-head#1908
• [2018-06-22 00:47] Validation started with lhcb-head#1892
• [2018-06-22 00:50] Validation started with lhcb-moore-test#95
• [2018-06-22 00:50] Validation started with lhcb-tdr-test#191
• [2018-06-22 00:53] Validation started with lhcb-2018-patches#251
• [2018-06-22 01:00] Validation started with lhcb-lcg-dev4#563
• [2018-06-22 01:03] Validation started with lhcb-lcg-dev3#563

added 1 commit

• 0b47a7c1 - Prepare v28r3 release

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mentioned in commit aab330ee