Moves logging into reader_fsm

[anarthal]

• Removes logging all the reader actions, and logs specific messages inside the reader_fsm instead
• Adds constructors to reader actions
• Makes reader_fsm use connection_state
• Refactors reader_fsm tests
• Moves exec_fsm action printing to test code

[anarthal]

This should entail no functional change (aside from logging). I'd find it useful to have this if I need to somehow touch the reader in #328