Revert changes in `strToIPNet` func #439

Job	Run time
golangci-lint	2m 45s
yamllint	12s
exclude fmt.Errorf	3s
build and test (ubuntu-latest)	32s
Exclude replace in go.mod	2s
build and test (macos-latest)	29s
check go.mod and go.sum	11s
build and test (windows-latest)	1m 31s
Check generated files	22s
Restrict dependencies on github.com/networkservicemesh/*	4s
	6m 11s

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