Add a constructor for vl3.IPAM #6260

Job	Run time
code-cov (ubuntu-latest)	2m 31s
code-cov (ubuntu-latest)	2m 31s
code-cov (macos-latest)	3m 22s
code-cov (macos-latest)	4m 19s
build-and-test / build-and-test (ubuntu-latest)	2m 24s
build-and-test / build-and-test (ubuntu-latest)	2m 24s
build-and-test / build-and-test (macos-latest)	1m 36s
build-and-test / build-and-test (macos-latest)	1m 36s
yamllint / yamllint	9s
yamllint / yamllint	9s
build-and-test / build-and-test (windows-latest)	1m 29s
build-and-test / build-and-test (windows-latest)	1m 29s
checkgomod / checkgomod	26s
checkgomod / checkgomod	26s
exclude-fmt-errorf / exclude-fmt-errorf	9s
exclude-fmt-errorf / exclude-fmt-errorf	9s
exclude-replace / excludereplace	4s
exclude-replace / excludereplace	4s
gogenerate / gogenerate	51s
gogenerate / gogenerate	51s
golangci-lint / golangci-lint	41s
golangci-lint / golangci-lint	41s
restrict-nsm-deps / restrict-nsm-deps	3s
restrict-nsm-deps / restrict-nsm-deps	3s
	28m 27s

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