Add Java wrapper support to OpenMPI

[ocaisa]

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Java wrapper support is currently experimental in OpenMPI.

I've added support for the wrappers to the EasyBlock, but I don't intend to upload an easyconfig that uses them since choosing a Java version will introduces a new degree of freedom in our toolchains (and it is likely to be a very site-specific choice)

[ocaisa]

Test report by @ocaisa

Overview of tested easyconfigs (in order)

• SUCCESS OpenMPI-4.1.0-GCC-10.2.0.eb

Build succeeded for 1 out of 1 (1 easyconfigs in total) generoso - Linux centos linux 8.2.2004, x86_64, Intel(R) Xeon(R) CPU E5-2667 v3 @ 3.20GHz, Python 3.6.8 See https://gist.github.com/073f203db02e1cbae9f9bacfbfbb8637 for a full test report.

[ocaisa]

Test report by @ocaisa

Overview of tested easyconfigs (in order)

• SUCCESS OpenMPI-4.1.0-GCC-10.2.0-java.eb

Build succeeded for 1 out of 1 (1 easyconfigs in total) generoso - Linux centos linux 8.2.2004, x86_64, Intel(R) Xeon(R) CPU E5-2667 v3 @ 3.20GHz, Python 3.6.8 See https://gist.github.com/e7e1a5bbe852d1be2c58518b528d4932 for a full test report.

[ocaisa]

Easyconfig tested is a stock easyconfig with a java dep:

[ocaisa@generoso ~]$ !diff
diff /users/ocaisa/EasyBuild_Git/easybuild-easyconfigs/easybuild/easyconfigs/o/OpenMPI/OpenMPI-4.1.0-GCC-10.2.0.eb ./OpenMPI-4.1.0-GCC-10.2.0-java.eb 
2a3
> versionsuffix = '-java'
23a25
>     ('Java', '11', '', True),

[akesandgren]

@ocaisa this needs a conflict resolution