pipeline_lua: skip Lua callbacks when resetting VM
pipeline_lua: skip Lua callbacks when resetting VM

There's no point in making the Lua code clean up its datastructures since the
entire VM is going to be destroyed. This also fixes a problem where Lua code
could fail a table entry delete operation during a reset, which would cause the
gentable infrastructure to log an error and leak memory.

vezril/ivs,vezril/ivs,floodlight/ivs,floodlight/ivs,floodlight/ivs,vezril/ivs