Temurin-build: OpenJDK 11 JDK Builds Have Inconsistent Root

Platform:
Linux (at least)

Architecture:
x64 (at least)

Currently, the tarball containing JDK 11 (both Hotspot and OpenJ9) are rooted at a different directory than the JRE 11 and JRE/JDK 8 tarballs:

$: tar tf OpenJDK8U-jre_x64_linux_hotspot_8u192b12.tar.gz  | sort | head -n 2
./jdk8u192-b12-jre/
./jdk8u192-b12-jre/ASSEMBLY_EXCEPTION

$: tar tf OpenJDK8U-jdk_x64_linux_hotspot_8u192b12.tar.gz | sort | head -n 2
./jdk8u192-b12/
./jdk8u192-b12/ASSEMBLY_EXCEPTION

$: tar tf OpenJDK11-jre_x64_linux_hotspot_11_28.tar.gz  | sort | head -n 2
./jdk-11+28-jre/
./jdk-11+28-jre/bin/

$: tar tf OpenJDK11U-jdk_x64_linux_hotspot_11.0.1_13.tar.gz  | sort | head -n 2
jdk-11.0.1+13/
jdk-11.0.1+13/bin/

Note that most of the archives have two levels (e.g. . and jdk8u192-b12-jre) where JDK 11 has only one level (e.g. jdk-11.0.1+13). This makes handling all AdoptOpenJDK archives consistently impossible and an exception case needs to be written for this one binary.

The JDK 11 build should produce an artifact consistent with the rest. While the most obvious change would be to move JDK 11's directory structure down one, I'd actually prefer moving the rest up a level. It's not a strong preference though, so I'd much rather have _any_ consistency.