UnixPB: Add Zulu7 for JDK8 Build bootstrap, make buildJDK.sh use JDK7

[Willsparker]

ref: adoptium/temurin-build#1732

Add in Zulu-7 to Unix playbook, as it can be a consistent JDK-7 amongst all the distributions, as some new linux distros are unable to install openjdk-7 with their package manager.

[Willsparker]

FYI, zulu-7 is installed using the shell module, using wget and tar as both the unarchive and get_url ansible modules would throw the following errors, even with validate_certs: false.

"msg": "Failed to validate the SSL certificate for cdn.azul.com:443. Make sure your managed systems have a valid CA certificate installed. If the website serving the url uses SNI you need python >= 2.7.9 on your managed machine (the python executable used (/usr/bin/python) is version: 2.6.6 (r266:84292, Jun 20 2019, 14:14:55) [GCC 4.4.7 20120313 (Red Hat 4.4.7-23)]) or you can install theurllib3, pyOpenSSL, ndg-httpsclient, and pyasn1python modules to perform SNI verification in python >= 2.6. You can use validate_certs=False if you do not need to confirm the servers identity but this is unsafe and not recommended. Paths checked for this platform: /etc/ssl/certs, /etc/pki/ca-trust/extracted/pem, /etc/pki/tls/certs, /usr/share/ca-certificates/cacert.org, /etc/ansible. The exception msg was: [Errno 1] _ssl.c:492: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol."
However, running wget manually on the machine did work, hence why shell works.

[Willsparker]

https://ci.adoptopenjdk.net/view/Tooling/job/VagrantPlaybookCheck/573/
VagrantPlaybookCheck run ^

[sxa]

I would prefer to only install this where the distribution doesn't have it's own openjdk7 available - can we adjust the conditionals accordingly to only put this on the recent distros that have it?

[Willsparker]

With the latest commit, the PR has include fairly significant changes to buildJDK.sh:

1. remove code to find the distribution specific versions of JDK8 to set JAVA_HOME with as it's unnecessary as we install jdk8 with adoptopenjdk_install
2. Remove setting JDK7_BOOT_DIR, as setting JDK_BOOT_DIR takes priority in the build, when building JDK8
3. Set JDK_BOOT_DIR to be JDK7 when building JDK8 (it was previously setting JDK8).

[sxa]

Latest changes won't take effect on e.g. Ubuntu 20.04 - can we change the version conditionals to be > or >= comparisons please?

[sxa]

Ref the issues with unarchive I don't believe we need to install zulu-7 on any distributions which have such an old version of python, and since we've now restricted the distributions which this role runs on, we should probably switch it back to use the unarchive role instead of the shell operation

[Willsparker]

https://ci.adoptopenjdk.net/view/Tooling/job/VagrantPlaybookCheck/581/OS=SUSE12,label=infra-vagrant-1/console
Unfortunately, SUSE/SLES12 IS new enough to not have openjdk-7 in it's package repos, but does have a version of python low enough to cause issues with the unarchive repo. For now, I've removed it from the zulu-7 install, as we don't have any SLES build machines (and only one test machine), it shouldn't matter if it uses jdk-8 to build JDK-8 for the playbook check.
That being said, @sxa If you want, I can put back in that shell module task and make it run only for SLES/OpenSUSE.

[Willsparker]

Between https://ci.adoptopenjdk.net/view/Tooling/job/VagrantPlaybookCheck/OS=CentOS8,label=infra-vagrant-1/584/
and
https://ci.adoptopenjdk.net/view/Tooling/job/VagrantPlaybookCheck/OS=Ubuntu1804,label=infra-vagrant-1/582/
It appears to work for the other distributions.