Intel packages: multiple installs and optional scalapack libs (#11384)

Add fixes to support multiple installs and dependents using a subset
of IntelPackage functionality.

* Update IntelPackage to only return scalapack libraries if the root
  spec depends on MPI: scalapack requires MPI to be mentioned as a
  dependency in the DAG. Package builds using intel-mkl for its
  blas/lapack implementations but not for scalapack were failing to
  build.

  Ideally it would be possible to ask if any of the packages in the
  DAG are actually requesting the scalapack functionality provided by
  the IntelPackage and only return scalapack libs in that case, but
  that is not easily done at this time.

  Fixes #11314
  Fixes #11289

* set HOME when the intel silent installer is run. This prevents the
  installer from using the ~/intel directory (which can cause
  conflicts for multiple installs of the same IntelPackage)

  Fixes #9713

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