narval #2148170 starting narvalbot shouldn't be so verbose [validation pending]

When we start the bot we log everything about loading plugins to standard output, including debug msgs.

prioritynormal
typebug
done in3.2.0
load0.100
load left0.000
closed by#8e93a2a9e829 narvalbot: move load_plugins after init_log (closes #2148170)