registry: support aliyun registry

[Ace-Tang]

since containerd just support OAuth2 authentication, the patch is for compatible registries who do not implement OAuth2 authentication，especially for aliyun registry: reg.docker.alibaba-inc.com

Signed-off-by: Ace-Tang [email protected]

[Ace-Tang]

hi, @allencloud ,PTAL

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (v1.0.0-dev@89623f2). Click here to learn what that means. The diff coverage is 0%.

@@              Coverage Diff              @@
##             v1.0.0-dev       #2   +/-   ##
=============================================
  Coverage              ?   50.64%           
=============================================
  Files                 ?       81           
  Lines                 ?     7161           
  Branches              ?        0           
=============================================
  Hits                  ?     3627           
  Misses                ?     2850           
  Partials              ?      684

Flag	Coverage Δ
#linux	50.64% <0%> (?)

Impacted Files	Coverage Δ
remotes/docker/resolver.go	62.36% <0%> (ø)

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[allencloud]

LGTM

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