podman import url does not work

[juhp]

/kind bug

Description
podman import --help says

Note remote tar balls can be specified, via web address.

but this appears not to work.

Steps to reproduce the issue:

1. podman import http://kojipkgs.fedoraproject.org/packages/Fedora-Container-Base/Rawhide/20190719.n.1/images/Fedora-Container-Base-Rawhide-20190719.n.1.x86_64.tar.xz

Describe the results you received:

Error: invalid filename (should not contain ':') "http://kojipkgs.fedoraproject.org/packages/Fedora-Container-Base/Rawhide/20190719.n.1/images/Fedora-Container-Base-Rawhide-20190719.n.1.x86_64.tar.xz"

(Omitting http:// gives a different error)

Describe the results you expected:

No error

Output of podman version:

Version:            1.4.4
RemoteAPI Version:  1
Go Version:         go1.12.7
OS/Arch:            linux/amd64

Output of podman info --debug:

debug:
  compiler: gc
  git commit: ""
  go version: go1.12.7
  podman version: 1.4.4
host:
  BuildahVersion: 1.9.0
  Conmon:
    package: podman-1.4.4-4.fc30.x86_64
    path: /usr/libexec/podman/conmon
    version: 'conmon version 1.0.0-dev, commit: 164df8af4e62dc759c312eab4b97ea9fb6b5f1fc'
  Distribution:
    distribution: fedora
    version: "30"
  MemFree: 1687924736
  MemTotal: 16450478080
  OCIRuntime:
    package: runc-1.0.0-93.dev.gitb9b6cc6.fc30.x86_64
    path: /usr/bin/runc
    version: |-
      runc version 1.0.0-rc8+dev
      commit: e3b4c1108f7d1bf0d09ab612ea09927d9b59b4e3
      spec: 1.0.1-dev
  SwapFree: 8296329216
  SwapTotal: 8296329216
  arch: amd64
  cpus: 8
  hostname: localhost.localdomain
  kernel: 5.1.18-300.fc30.x86_64
  os: linux
  rootless: true
  uptime: 6h 18m 0.13s (Approximately 0.25 days)
registries:
  blocked: null
  insecure: null
  search:
  - docker.io
  - registry.fedoraproject.org
  - quay.io
  - registry.access.redhat.com
  - registry.centos.org
store:
  ConfigFile: /home/petersen/.config/containers/storage.conf
  ContainerStore:
    number: 4
  GraphDriverName: overlay
  GraphOptions:
  - overlay.mount_program=/usr/bin/fuse-overlayfs
  GraphRoot: /var/home/petersen/.local/share/containers/storage
  GraphStatus:
    Backing Filesystem: extfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Using metacopy: "false"
  ImageStore:
    number: 20
  RunRoot: /run/user/1000
  VolumePath: /var/home/petersen/.local/share/containers/storage/volumes

Additional environment details (AWS, VirtualBox, physical, etc.):
Fedora Silverblue 30

[rhatdan]

@QiWang19 PTAL