Fixes go1.11 vet warnings.
Cancel on WithTimeout must always be called to avoid memory leak:
pkg/provider/provider.go:73: the cancel function returned by context.WithTimeout should be called, not discarded, to avoid a context leak
Range over non-copyable things:
pkg/pool/connection_pool_test.go:32: range var v copies lock: struct{pool pool.ConnectionPool; key string; expected pool.TestFoo; expectedError error} contains pool.ConnectionPool contains sync.RWMutex
pkg/pool/connection_pool_test.go:56: range var v copies lock: struct{pool pool.ConnectionPool; key string; value pool.TestFoo; expected pool.TestFoo; expectedError error} contains pool.ConnectionPool contains sync.RWMutex
pkg/pool/connection_pool_test.go:83: range var v copies lock: struct{pool pool.ConnectionPool; key string; value pool.TestFoo; expected interface{}; expectedError error} contains pool.ConnectionPool contains sync.RWMutex
zeebo/errs package always requires formatting directives:
pkg/peertls/peertls.go:50: Class.New call has arguments but no formatting directives
pkg/peertls/utils.go:47: Class.New call has arguments but no formatting directives
pkg/peertls/utils.go:87: Class.New call has arguments but no formatting directives
pkg/overlay/cache.go:94: Class.New call has arguments but no formatting directives
pkg/provider/certificate_authority.go:98: New call has arguments but no formatting directives
pkg/provider/identity.go:96: New call has arguments but no formatting directives
pkg/provider/utils.go:124: New call needs 1 arg but has 2 args
pkg/provider/utils.go:136: New call needs 1 arg but has 2 args
storage/redis/client.go:44: Class.New call has arguments but no formatting directives
storage/redis/client.go:64: Class.New call has arguments but no formatting directives
storage/redis/client.go:75: Class.New call has arguments but no formatting directives
storage/redis/client.go:80: Class.New call has arguments but no formatting directives
storage/redis/client.go:92: Class.New call has arguments but no formatting directives
storage/redis/client.go:96: Class.New call has arguments but no formatting directives
storage/redis/client.go:102: Class.New call has arguments but no formatting directives
storage/redis/client.go:126: Class.New call has arguments but no formatting directives
