Renamed bootstrap_vars for new syntax

Change-Id: I8467cfc066f1f2a7e1ea647b313d75df46a5a2d7
diff --git a/classes/cluster/virtual-mcp11-aio/bootstrap_vars b/classes/cluster/virtual-mcp11-aio/extra.env
similarity index 100%
rename from classes/cluster/virtual-mcp11-aio/bootstrap_vars
rename to classes/cluster/virtual-mcp11-aio/extra.env