git: openjdk/jdk-sandbox: simpleserver: small fixes to address intermittent test failures

[Julia Boes]

Changeset: 8f44c8f6
Author:    Julia Boes <julia.boes at oracle.com>
Date:      2021-07-21 16:13:58 +0000
URL:       https://git.openjdk.java.net/jdk-sandbox/commit/8f44c8f6d0c529615b59a3b018f0b3f339a0f870

small fixes to address intermittent test failures

! test/jdk/com/sun/net/httpserver/simpleserver/HttpsServerTest.java
! test/jdk/com/sun/net/httpserver/simpleserver/SimpleFileServerTest.java