* Convert autoupdate version handling to coreos/go-semver
* get the right version in installer endpoint + get rid of x/mod/semver
* depguard x/mod/semver
* Add nolint rules for existing x/mod/semver usages
* Add depguard explanation
* Fix incorrect docs URLs
* Fix outdated Teleport URLs in testdata files
The tests do not require the URLs to include a `goteleport.com` domain
name, so change these URLs to `example.com` to prevent docs URL checkers
from flagging these files.
* Remove logging from circuit breaker
The logging is never output, and if it was would be very verbose.
Instead of dropping the level down to trace the logger is removed
entirely.
* Add constants from trace library
The logging functionality in trace is being removed in an upcoming
release. To prepare the logging component keys are copied from trace
into teleport.
* Convert trace.ComponentFields to teleport.ComponentFields
* Replace trace.Component with teleport.ComponentKey
* Replace trace logging constants
Zac Bergquist