Merge pull request #150 from reallyenglish/mitsuruy

new Port: www/moodle25 imported from the HEAD
check_postgres uses psql
Merge pull request #151 from reallyenglish/check_postgres_no_dbd

check_postgres uses psql
check_postgres upgrade to 2.21
Merge pull request #152 from reallyenglish/check_postgres_2.21

check_postgres upgrade to 2.21
new user for sensu
Merge pull request #153 from reallyenglish/tomoyukis

new user for sensu
performance improvements and other changes to pkgupgrade.rb

- do pkg_info -oa and parse it to reduce the times of executing
  command

  doing pkg_info -o for each package takes much cost on some hardwares
  which performance is very poor.

- log pkg_info and version parse errors
- refresh index only if ftpindex is modified
- refresh pkgdb cache only if pkgdb directory is modified. and also
  change debug logs to info