Add token path to Agent config Command block (#958)

* support reading token from file via config

* remove empty file

* simplify token validation and add unit tests

* add unit tests for transport credentials funtions

* address PR feedback

* proto updates

* fix function name

* fix lint error: lll

* add missing PR feedback

* remove error log message

* fix unit test

* Fix apk test package naming (#961)

* modify alpine package name:
nginx-agent-3.0.0_1234 -> nginx-agent-3.0.0.1234

* protoc-gen update

* Update agent config defaults and format (#959)

* update config defaults and format

* Add config apply request queue (#949)

* add unit tests for transport credentials funtions

* fix test name

* fix error message

* fix lint error: lll

* modify error messages

* remove error logging and modify messages

* fall back to token field if error occurs when reading file

* fix bad merge

* restarting gRPC conn

* remove code from testing

* fix lint errors: whitespace, revive

* use tokenpath as config option, fixes problem with cli param parsing

* correct yaml key in AuthConfig

* proto updates

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Co-authored-by: aphralG <108004222+aphralG@users.noreply.github.com>
Co-authored-by: Donal Hurley <djhurley1990@gmail.com>

Author: 3 people