log: change default log level to notice

This patch updates the log level of meaningful start messages to
notice. It also sets the default log level to notice.
suricata: reorder start

Initalizing output just after configuration file parsing allow to
log almost all messages accordingly to configuration.
suricata: info message after log init

This patch moves version display after log init so we can have an
homogeneous display.
suricata: add -v[v] option to increase verbosity

This patch adds a -v option to suricata. It increases the log level
defined in the YAML.