SEACAS: Add preliminary support for seacas package (#9972)

* SEACAS: Add preliminary support for seacas package

* Eliminate leftover from package I copied from.

* And remove another stray line

Sorry, thought I had checked this better...

* SEACAS: Shorten long lines; fixup indentation

* SEACAS: Remove unused os import

* Add PLASMA version 18.11.0 and Lua variant (#9689)

* Add PLASMA 18.11.1 with optional Lua and test for headers

* New versions for a few python modules (#9969)

* py-jupyter-console: Add version 5.2.0

* py-jupyter-core: add version 4.4.0

* py-lxml: add version 4.2.5

* py-zmq: add version 17.1.2

* py-terminado: add version 0.8.1

* py-pexpect: add version 4.6.0

* py-pytables: add version 3.4.4

* SEACAS: Default to mpi on

* SEACAS: Modify to reduce variants

Instead of using an `allpkgs` or explicitly specifying each individual subset,
changed to minimize variants:
 * By default, the exodus and IOSS libraries are built and a few
   executables directly related to the IOSS library.
 * variant `common` defaults to True and builds the "common" seacas
   applications.  This is based on my definition, so there may be
   could be some discussion on what belongs here.
 * variant `legacy` defaults to True and builds the remainder of the
   seacas applications.  These are still used, but mainly in more
   esoteric areas.  Might be better to default to False, but I wanted
   default to just build everything which is what other SEACAS builds
   always do...

Removed the `kokkos` variants for now as I need to do some more
thinking on how best to support this.  Not often used currently,
so shouldn't be an issue.

Cleaned up other issues raised by Adam and found by me.

* SEACAS: Address flake8 issues

* SEACAS: Clean up variant package logic

Fixed package variant logic.
Consolidated some other variant handling logic
Other minor refactors for hopefully better readability

* SEACAS: Fix flake8 error

Missing whitespace around operator fixed.

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