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Migrated command line processing in agent from jessevdk/go-flags to urfave/cli/v2.
Thanks to this it is possible to define commands in command line.
Previously only switches were possible in command line.

Server SSE mechanism parses query parameters and sets event filters
accordingly. Supported parameters are: machine, daemon, subnet, user, app,
appType and daemonName.

I reverted back to the convention of getters having "Get". We will later
discuss our naming conventions. For now being this makes the code
consistent.

When detected no configuration change for a daemon the server will skip
updating subnets and shared networks. When detected that none of the DHCP
daemons have changed their configuration the global hosts aren't updated.

The config hash will be later used to determine whether the config should
be updated or not.

The response arguments hash can be optionally computed for selected
commands.

This migration extends kea_daemon table with config_hash column which
optionally holds hashed Kea config.

 - words, words, words

 yeah, unrelated to the ticket, but trivial to do.

Next to the settings panel we have added a new info message explaining
what it means to setup an interval. It is described as an idle time period
between the end of the previous data pull to the beginning of the next
data pull.

Reset function forcibly restarts the puller. The Unpause() function only
starts the puller when number of unpause calls decreased the counter to 0.
This what caught in the review.

Pullers are temporarily stopped for a period of time when puller action
is being run. This guarantees that the next action is triggered a certain
period of time after the current action has finished. This is important
when actions take a lot of time, e.g. adding new machine with many subnets.

Described default-signifies-exhaustive per review comments.

Included the info that golangcilint was upgraded.

Explicitly listing all linters as recommended by the package authors. Some
linters have been disabled and appropriate comments were added. cognitive
complexity threshold was bumped to 50.