adminscripts: make info commands not use pidfile

otherwise they conflict with change operations.
londiste create: load node name and initial provider also from config
cascadeadmin: avoid hardwired db name
Merge remote-tracking branch 'gamato/master'
cascadeadmin: forgot to make node_name optional everywhere
tests/londiste/regen.sh: test various combination of options
londiste: connection profiles

Way to add extra connect string parameters for non-config
connection strings (public node locations).