Use 2.2 as the default mysql_module

Change-Id: Ib040a79a88830f1c2965bd6e5416983131ece9ce
minor fixes for cisco nexus ml2 plugin

This fix resolves the issue where the ssh keyscan
uses username instead of ip address and clean up
unneeded file path code.

Change-Id: Ie6c7889937f56b40dc72b551eb859dfc2d670193
Merge "minor fixes for cisco nexus ml2 plugin"
Merge "Use 2.2 as the default mysql_module"