Description
While in "Docker version 17.12.0-ce, build c97c6d6", the scheme tcp in "-H" is not required, docker cli will add it Automatically. But in docker master, it will raise an error.

Is this feature removed in plan or just an error?

Steps to reproduce the issue:

1. build/docker -H 172.17.254.15:8410 ps

Describe the results you received:
parse 172.17.254.15:8410: first path segment in URL cannot contain colon

Describe the results you expected:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3655addd70cf testredis:latest "docker-entrypoint.s…" 12 hours ago Up 12 hours 6379/tcp testredis.1.be7884xqcywuwdo3b86mpmozb

Additional information you deem important (e.g. issue happens only occasionally):

Output of docker version:
root@dockerdemo:~/gocode/src/github.com/docker/cli# build/docker version
Client:
Version: unknown-version
API version: 1.39
Go version: devel +30c1ed7 Sat Oct 6 00:02:35 2018 +0000
Git commit: b9a1a21
Built: Fri Oct 12 01:42:29 2018
OS/Arch: linux/amd64
Experimental: false

Server:
Engine:
Version: dev
API version: 1.39 (minimum version 1.12)
Go version: go1.11.1
Git commit: 5d82d77
Built: Thu Oct 11 02:41:04 2018
OS/Arch: linux/amd64
Experimental: true

Output of docker info:
Containers: 30
Running: 20
Paused: 0
Stopped: 10
Images: 376
Server Version: dev
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: active
NodeID: nlcdk6e11zro6x4hbw55vafiq
Is Manager: true
ClusterID: xkuby3a03f29z41n2biii2mc0
Managers: 1
Nodes: 1
Default Address Pool: 10.0.0.0/8
SubnetSize: 24
Orchestration:
Task History Retention Limit: 5
Raft:
Snapshot Interval: 10000
Number of Old Snapshots to Retain: 0
Heartbeat Tick: 1
Election Tick: 3
Dispatcher:
Heartbeat Period: 5 seconds
CA Configuration:
Expiry Duration: 3 months
Force Rotate: 0
Autolock Managers: false
Root Rotation In Progress: false
Node Address: 172.17.254.34
Manager Addresses:
172.17.254.34:2377
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 9f2e07b1fc1342d1c48fe4d7bbb94cb6d1bf278b
runc version: 69663f0bd4b60df09991c08812a60108003fa340
init version: fec3683
Security Options:
apparmor
seccomp
Profile: default
Kernel Version: 4.4.0-105-generic
Operating System: Ubuntu 16.04.3 LTS
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 3.859GiB
Name: dockerdemo
ID: DYEJ:3IVL:NK53:YFIS:AJMT:VOGT:2HIB:7VZS:GN5A:FFP5:NIAY:QXDS
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Labels:
Experimental: true
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false

WARNING: API is accessible on http://0.0.0.0:8410 without encryption.
Access to the remote API is equivalent to root access on the host. Refer
to the 'Docker daemon attack surface' section in the documentation for
more information: https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface
WARNING: No swap limit support

Additional environment details (AWS, VirtualBox, physical, etc.):
Aliyun ECS