Use CNI Plugins at Specific Versions

[ginglis13]

Current integration testing for CNI plugins uses plugins at their latest versions:

firecracker-containerd/Makefile

Lines 235 to 249 in 3c25750

	BRIDGE_BIN?=$(BINPATH)/bridge
	$(BRIDGE_BIN):
	GOBIN=$(dir $@) GO111MODULE=off go get -u github.com/containernetworking/plugins/plugins/main/bridge
	PTP_BIN?=$(BINPATH)/ptp
	$(PTP_BIN):
	GOBIN=$(dir $@) GO111MODULE=off go get -u github.com/containernetworking/plugins/plugins/main/ptp
	HOSTLOCAL_BIN?=$(BINPATH)/host-local
	$(HOSTLOCAL_BIN):
	GOBIN=$(dir $@) GO111MODULE=off go get -u github.com/containernetworking/plugins/plugins/ipam/host-local
	FIREWALL_BIN?=$(BINPATH)/firewall
	$(FIREWALL_BIN):
	GOBIN=$(dir $@) GO111MODULE=off go get -u github.com/containernetworking/plugins/plugins/meta/firewall

containerd builds and installs plugins at a specific commit, perhaps fc-cd should take a similar approach: https://github.com/containerd/containerd/blob/fc5c51d5f4eb5152519f3ba7b7a23ccbf5176b5b/script/setup/install-cni