Switch log level for messages from info to debug

[jarnfast]

Porter now passes and handles log levels for plugins in a different way. This means that the messages would be present even when verbosity is set to info - which can garble the data when requesting to show the output as everything is sent to stdout.

Introduced in porter 1.2.0

Behavior in porter <1.2.0:

$ porter installations output show my_output -i my-bundle
data-from-output

Behavior in porter >1.2.0

$ porter installations output show my_output -i my-bundle
NewPlugin.Config.Namespace: porter-system
Store.connect: pre-clientset namespace : porter-system
Store.connect: post-clientset namespace : porter-system
data-from-output

This extra messages can be hidden by setting verbosity to error or warn but I think a better behavior is to hide them in the normal use case (ie. with verbosity set to info).

Behavior after my changes with porter >1.2.0:

$ porter installations output show my_output -i my-bundle
data-from-output

$ porter installations output show my_output -i my-bundle --verbosity debug
<snipped>
NewPlugin.Config.Namespace: porter-system
using plugin
plugin address
Store.connect: pre-clientset namespace : porter-system
Store.connect: post-clientset namespace : porter-system
Store.Resolve: ns:porter-system, keyName:secret, keyValue:01JHJ2KQ2QQQ0KQ4DJ75X75D2P-my_output
data-from-output

[kichristensen]

Thanks for the PR.
I agree with you, it makes sense to change the level of the log message.