Starting v2 release following API break

[dims]

In cd60aa4, we changed the API leading
to issues like:

src/k8s.io/client-go/transport/round_trippers.go:70:11: cannot convert klog.V(9) (type klog.Verbose) to type bool

So we should move to v2 of klog

Change-Id: Ibf270e0e6dd326fa91d18140e92139455cbe4de0

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

[dims]

/hold

(for discussion)

[dims]

/assign @DirectXMan12

[dims]

/assign @liggitt

[liggitt]

if we're committed to cd60aa4 (which still seems strange to me, see comment at #20 (comment)), then we should definitely rev the version to avoid breaking consumers.

in addition to this, I think we'd want to do something like create a release-1.x branch and v1.0.0 tag at the commit just prior to #20)

[DirectXMan12]

I replied a bit to your comment in #20 (comment) and #20 (comment).

TL;DR: this is a decent stopgap till we can get through a KEP to switch all of client-go and friends over to structured logging natively. That's a lot more work longterm, though (I'd like to get it done, but even if we were to start now, it'd still be a while).

[dims]

+1 to get this in AND cut a release-1.x branch AND v1.0.0 tag at the commit just prior to #20

[liggitt]

I would recommend reverting #20, changing to v2, then considering reintroducing #20

[DirectXMan12]

we may want to do the /v2 branch approach as well, since a) it gives us a path to do bugfixes on v1 and b) considering the number of people trying to go get w/o module support.

[dims]

/hold cancel

[liggitt]

do you need to change go_import_path: k8s.io/klog/v2 in travis?

[liggitt]

and update the readme to note the minimum go version

[liggitt]

might need something like this in travis (dropping go 1.9):

...
go_import_path: k8s.io/klog/v2
...
go:
  - 1.10.x
  - 1.11.x
  - 1.12.x
  - 1.13.x
...

[liggitt]

add 1.13.x?

[dims]

done

[liggitt]

=== RUN   TestHeaderWithDir
--- FAIL: TestHeaderWithDir (0.00s)
    klog_test.go:217: log format error: 0 elements, error input does not match format:
        I0102 15:04:05.067890    1234 v2/klog_test.go:212] test
    klog_test.go:223: log format error: got:
        	"I0102 15:04:05.067890    1234 v2/klog_test.go:212] test\n"
        want:	"I0102 15:04:05.067890    1234 klog/klog_test.go:0] test\n"

[dims]

fixing test

[liggitt]

/lgtm

[k8s-ci-robot]

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