bugfix: restful api url should support both with or without version info

[HusterWan]

Signed-off-by: Michael Wan zirenwan@gmail.com

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

i check the moby api, it also support with or without version info in restful api url

Now we support both without version info in restful api url:

wanziren@osboxes:pouch (zr/fix-api-version) -> sudo curl /var/run/pouchd.sock http://0.0.0.0:8080/info
curl: (3) <url> malformed
{"Containers":200,"ContainersRunning":200,"Debug":true,"DefaultRegistry":"registry.hub.docker.com","DefaultRuntime":"runc","DriverStatus":null,"IndexServerAddress":"https://index.docker.io/v1/","KernelVersion":"3.10.0-693.17.1.el7.x86_64","Labels":[],"ListenAddresses":["tcp://0.0.0.0:8080","unix:///var/run/pouchd.sock"],"OSType":"linux","PouchRootDir":"/var/lib/pouch","SecurityOptions":null,"ServerVersion":"0.4.0-dev"}

and with version info in restful api url:

wanziren@osboxes:pouch (zr/fix-api-version) -> sudo curl /var/run/pouchd.sock http://0.0.0.0:8080/v1.24/info
curl: (3) <url> malformed
{"Containers":200,"ContainersRunning":200,"Debug":true,"DefaultRegistry":"registry.hub.docker.com","DefaultRuntime":"runc","DriverStatus":null,"IndexServerAddress":"https://index.docker.io/v1/","KernelVersion":"3.10.0-693.17.1.el7.x86_64","Labels":[],"ListenAddresses":["tcp://0.0.0.0:8080","unix:///var/run/pouchd.sock"],"OSType":"linux","PouchRootDir":"/var/lib/pouch","SecurityOptions":null,"ServerVersion":"0.4.0-dev"}

Ⅲ. Describe how you did it

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #1035 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1035   +/-   ##
=======================================
  Coverage   15.18%   15.18%           
=======================================
  Files         135      135           
  Lines        8483     8483           
=======================================
  Hits         1288     1288           
  Misses       7094     7094           
  Partials      101      101

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[allencloud]

Please add an API integration test to cover this. @HusterWan 😄

[allencloud]

I think this is already an API integration test for the target.

[allencloud]

LGTM