Add changelog entry for hashicorp#3773

CHANGELOG.md

@@ -26,6 +26,7 @@ BUG FIXES:
  * client: Always advertise driver IP when in driver address mode [[GH-3682](https://github.com/hashicorp/nomad/issues/3682)]
  * client/vault: Recognize renewing non-renewable Vault lease as fatal [[GH-3727](https://github.com/hashicorp/nomad/issues/3727)]
  * config: Revert minimum CPU limit back to 20 from 100.
+ * driver/lxc: Cleanup LXC containers after errors on container startup. [[GH-3773](https://github.com/hashicorp/nomad/issues/3773)]
  * ui: Fix ui on non-leaders when ACLs are enabled [[GH-3722](https://github.com/hashicorp/nomad/issues/3722)]
  * ui: Fix requests using client-side certificates in Firefox. [[GH-3728](https://github.com/hashicorp/nomad/pull/3728)]