Remove Hoek library

[malave]

According to Github:

Known moderate severity security vulnerability detected in hoek < 5.0.3defined in package-lock.json.
package-lock.json update suggested: hoek ~> 5.0.3.

Since 5.0.3 is already the latest version and we are using it in a single place we should find a way to do the same functionality using another way (maybe lodash):

conveyor/api/plugins/metrics-logger.plugin.js

Line 14 in 1566c29

const settings = Hoek.applyToDefaults(Defaults, options, true);

[wrathagom]

@malave it looks like we are using 4.2.1 and it is recommending that we upgrade to 5.0.3 or am I reading it wrong?