Bump github.com/go-sql-driver/mysql from 1.6.0 to 1.7.1 #291

Job	Run time
Build images	2m 9s
test (GODOG_FEATURE=active_nodes.feature make test)	7m 25s
test (GODOG_FEATURE=async.feature make test)	4m 9s
test (GODOG_FEATURE=cascade_replicas.feature make test)	6m 52s
test (GODOG_FEATURE=CLI.feature make test)	4m 3s
test (GODOG_FEATURE=crash_recovery.feature make test)	4m 34s
test (GODOG_FEATURE=events_reenable.feature make test)	1m 47s
test (GODOG_FEATURE=failover.feature make test)	12m 3s
test (GODOG_FEATURE=free_space.feature make test)	5m 36s
test (GODOG_FEATURE=host_discovery.feature make test)	2m 56s
test (GODOG_FEATURE=host_management.feature make test)	3m 5s
test (GODOG_FEATURE=maintenance.feature make test)	4m 31s
test (GODOG_FEATURE=offline_mode.feature make test)	2m 11s
test (GODOG_FEATURE=priority.feature make test)	5m 42s
test (GODOG_FEATURE=readonly_filesystem.feature make test)	2m 15s
test (GODOG_FEATURE=recovery.feature make test)	3m 9s
test (GODOG_FEATURE=repair.feature make test)	9m 59s
test (GODOG_FEATURE=statefile.feature make test)	4m 16s
test (GODOG_FEATURE=switchover_from.feature make test)	10m 19s
test (GODOG_FEATURE=switchover_to.feature make test)	10m 33s
test (GODOG_FEATURE=zk_failure.feature make test)	7m 17s
test (GODOG_FEATURE=zk_maintenance.feature make test)	3m 53s
	1h 58m 44s

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