Make `TestServerRequestTimeout` deadline assertion log print expected
and actual values in the same format for more clear troubleshooting.

Signed-off-by: Austin Vazquez <macedonv@amazon.com>

Bumps [golang.org/x/sys](https://github.com/golang/sys) from 0.0.0-20210124154548-22da62e12c0c to 0.1.0.
- [Release notes](https://github.com/golang/sys/releases)
- [Commits](https://github.com/golang/sys/commits/v0.1.0)

---
updated-dependencies:
- dependency-name: golang.org/x/sys
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Simplify close idle connections logic in server shutdown to be more
intuitive. Modify add connection logic to check if server has been
shutdown before adding any new connections. Modify test to make all
calls before server shutdown.

Signed-off-by: Austin Vazquez <macedonv@amazon.com>

…org/x/sys-0.1.0

Bump golang.org/x/sys from 0.0.0-20210124154548-22da62e12c0c to 0.1.0

Fix server shutdown logic

Rework deadline assertion logging to be more clear