Fixed sondas for the new model and changes
Changed NagiosOpts to abstract and added migrations
Last status is now a choices
Changed ip interpolation in nrpechecks
Merge branch 'sondas'

Conflicts:
	.gitignore
Added migration for sondas with NagiosOps as abstract
Merge https://github.com/tic-ull/arritranco
Fixed nagioschecks opts autoidfields
Fixed sondas migration