Support promtail reload config

[daixiang0]

Based on comment
Fix #16

Signed-off-by: Xiang Dai 764524258@qq.com

[Lysholm]

@daixiang0: Would this also cause promtail to reload TLS client config, even if say tls_config.cert_file config is unchanged? That is what i need for promtail to work as a telemetry provider in a mTLS enabled istio mesh :)

[daixiang0]

@slim-bean @cyriltovena hi, mind have a look for this? If meaningful, i would update and fix conflicts.

[stale]

This issue has been automatically marked as stale because it has not had any activity in the past 30 days. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[daixiang0]

@slim-bean @cyriltovena any update?

[stale]

This issue has been automatically marked as stale because it has not had any activity in the past 30 days. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[daixiang0]

@sh0rez @rfratto @slim-bean any input?

[sh0rez]

Hi, we have completely refactored and rewritten the configuration framework used in the meantime, so these changes are obsolete ;)

In case this issue still needs a fix, please open a new PR :D