Bump net-attach to v1.7

[manuelbuil]

What this PR does / why we need it:

Bump network-attachment-definition-client to v1.7.0.

It requires moving to skel.PluginMainFuncs instead of skel.PluginMain

Error: cmd/whereabouts.go:21:2: skel.PluginMain is deprecated: Use github.com/containernetworking/cni/pkg/skel.PluginMainFuncs instead.  (SA1019)

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 (optional):

[coveralls]

Pull Request Test Coverage Report for Build 8689302289

Details

• 0 of 35 (0.0%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.4%) to 71.99%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmd/whereabouts.go	0	35	0.0%
<!--	Total:	0	35	0.0%	-->

Files with Coverage Reduction	New Missed Lines	%
cmd/whereabouts.go	2	46.99%
<!--	Total:	2		-->

Totals
Change from base Build 8689276647:	-0.4%
Covered Lines:	1136
Relevant Lines:	1578

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💛 - Coveralls