Get/set ipv4/ipv6 address, up/down interface

Get/set ipv4/ipv6 address, up/down interface

[Feature]       Possibility to get/set ipv4/ipv6 address, up/down interface
[Cause]         N/A
[Solution]      Implemented: vsm_netdev_get_ipv4_addr, vsm_netdev_get_ipv6_addr,
                             vsm_netdev_set_ipv4_addr, vsm_netdev_set_ipv6_addr,
                             vsm_netdev_up, vsm_netdev_down,
                             vsm_lookup_netdev_by_name
[Verification]  Build, install
                    1) run test
                    2) set interfaces attributes (up, down) through cli and check it
                       "lxc-attach -n zoneId --lxcpath=/tmp/ut-zones -- ip addr"

Change-Id: I42ffa7e4c8f8cf2e22171d95b62884a2317d1107