Support RouterOS v7

[ddelnano]

All of the existing tests pass against routerOS v7 except the bpg related tests

Error:     resource_bgp_instance_test.go:48: Step 1/1 error: Error running apply: exit status 1
        
        Error: from RouterOS device: no such command prefix
        
          with mikrotik_bgp_instance.bar,
          on terraform_plugin_test.tf line 2, in resource "mikrotik_bgp_instance" "bar":
           2: resource "mikrotik_bgp_instance" "bar" {

We need to investigate why this error is happening

[ddelnano]

It seems that the bgp peer and instance configuration was designed in routerOS v7. This means that we will need to create new resources for v7 and need to disable these resources in the v7 test suite.

[ddelnano]

#51 has fully integrated a passing RouterOS v7 build. We will need to reimplement bgp support in #52 but otherwise this is complete.