Update OTP-26, OTP-27, OTP-28 #451

Job	Run time
docker (DIR=28 VARIANT=slim)	3m 5s
docker (DIR=28)	4m 11s
docker (DIR=master)	22s
docker (DIR=26 VARIANT=alpine)	7m 33s
docker (DIR=27)	3m 47s
docker (DIR=master VARIANT=alpine)	6m 44s
docker (DIR=26)	13m 0s
docker (DIR=27 VARIANT=alpine)	3m 15s
docker (DIR=27 VARIANT=slim)	2m 53s
docker (DIR=28 VARIANT=alpine)	3m 31s
docker (DIR=25)	11m 12s
docker (DIR=25 VARIANT=slim)	6m 3s
docker (DIR=25 VARIANT=alpine)	6m 47s
docker (DIR=26 VARIANT=slim)	7m 15s
	1h 19m 38s

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