fix error way of parsing URL for cmd exec and attach

[tanyifeng]

Parsing URL with url.schema other than prefix of URL.

Signed-off-by: t00416110 tanyifeng1@huawei.com

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[tanyifeng]

Subcmd exec and attach parse URL according to prefix “http”, Parse by prefix http, which may generate invalid http address http://127.0.0.1:10250//ip:port/xxx if URL is something like //ip:port/xxx, and cause exec command executed fail.

We should parse URL just like streaming.go

[tanyifeng]

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Signed

[tanyifeng]

The Travis CI failed due to go version in build machine is lower than go1.11.1

[feiskyer]

The Travis CI failed due to go version in build machine is lower than go1.11.1

Yep, k/k requires go 1.11.1 now. Let me update Go version first.

[feiskyer]

LGTM

[feiskyer]

Re-trigger travis testing...

[feiskyer]

gofmt check failed. @tanyifeng Could you fix gofmt issues?

[tanyifeng]

gofmt check failed. @tanyifeng Could you fix gofmt issues?

Done

[feiskyer]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: feiskyer, tanyifeng

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