LBaaS driver plugin shim to wrap v1 drivers

Since LBaaS drivers retain a call back to the plugin for DB operations
and similar it is necessary to warp both the v1 LBaaS driver and the v2
LBaas plugin. Both of these share common v2 two v1 LBaaS object
conversions.
Merge pull request #10 from dlundquist/lbaas-driver-shim

LBaaS driver shim