Bump github.com/go-sql-driver/mysql from 1.6.0 to 1.7.1 #300

Job	Run time
Build images	5s
test (GODOG_FEATURE=active_nodes.feature make test)	6m 37s
test (GODOG_FEATURE=async.feature make test)	3m 37s
test (GODOG_FEATURE=cascade_replicas.feature make test)	6m 39s
test (GODOG_FEATURE=CLI.feature make test)	4m 6s
test (GODOG_FEATURE=crash_recovery.feature make test)	4m 27s
test (GODOG_FEATURE=events_reenable.feature make test)	1m 58s
test (GODOG_FEATURE=failover.feature make test)	12m 0s
test (GODOG_FEATURE=free_space.feature make test)	5m 50s
test (GODOG_FEATURE=host_discovery.feature make test)	3m 6s
test (GODOG_FEATURE=host_management.feature make test)	3m 4s
test (GODOG_FEATURE=maintenance.feature make test)	4m 28s
test (GODOG_FEATURE=offline_mode.feature make test)	1m 57s
test (GODOG_FEATURE=priority.feature make test)	5m 52s
test (GODOG_FEATURE=readonly_filesystem.feature make test)	1m 58s
test (GODOG_FEATURE=recovery.feature make test)	3m 8s
test (GODOG_FEATURE=repair.feature make test)	9m 44s
test (GODOG_FEATURE=statefile.feature make test)	3m 56s
test (GODOG_FEATURE=switchover_from.feature make test)	10m 27s
test (GODOG_FEATURE=switchover_to.feature make test)	10m 24s
test (GODOG_FEATURE=zk_failure.feature make test)	7m 14s
test (GODOG_FEATURE=zk_maintenance.feature make test)	4m 0s
	1h 54m 37s

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