Git LFS not installed/initialized in `testing/Dockerfile`

[mattrobmattrob]

Git LFS not installed/initialized in testing/Dockerfile results in only (AFAIK) EnergyPlus related files not being checked out from https://github.com/lbl-srg/modelica-buildings such as libModelicaBuildingsEnergyPlus.so among others in the following list from the modelica-buildings repo:

$ git lfs ls-files --all
db49be9c64 - Buildings/Resources/Library/linux64/libModelicaBuildingsEnergyPlus.so
8669d4ff3d - Buildings/Resources/Library/linux64/libModelicaBuildingsEnergyPlus_9_6_0.so
c18e8e3d73 * Buildings/Resources/Library/linux64/libfmilib_shared.so
011fc668cf - Buildings/Resources/Library/win64/ModelicaBuildingsEnergyPlus_9_6_0.dll
65989657c0 - Buildings/Resources/Library/win64/ModelicaBuildingsEnergyPlus_9_6_0.lib
93186d3038 - Buildings/Resources/Library/win64/VCRUNTIME140.dll
35639f8396 * Buildings/Resources/Library/win64/fmilib_shared.dll
b972d511d9 * Buildings/Resources/Library/win64/fmilib_shared.lib
b8330cd751 - Buildings/Resources/src/ThermalZones/EnergyPlus_9_6_0/FMUs/Zones1.fmu
515838369e - Buildings/Resources/src/ThermalZones/EnergyPlus_9_6_0/FMUs/Zones3.fmu
46aee6b4e4 - Buildings/Resources/Library/linux64/libModelicaBuildingsEnergyPlus_9_6_0.so
d73b192db0 - Buildings/Resources/Library/win64/ModelicaBuildingsEnergyPlus_9_6_0.dll
4ba176cb08 - Buildings/Resources/Library/win64/ModelicaBuildingsEnergyPlus_9_6_0.dll
c82a846c8b - Buildings/Resources/src/ThermalZones/EnergyPlus_9_6_0/FMUs/Zones1.fmu
65507ae091 - Buildings/Resources/src/ThermalZones/EnergyPlus_9_6_0/FMUs/Zones3.fmu
5e175865a0 - Buildings/Resources/Library/linux64/libModelicaBuildingsEnergyPlus.so
337925f242 - Buildings/Resources/Library/win64/ModelicaBuildingsEnergyPlus.dll
e5e260c36c * Buildings/Resources/Library/win64/ModelicaBuildingsEnergyPlus.lib
...

This results in linker failures towards the end of a Modelica + Spawn of EnergyPlus compilation because these files aren't actually downloaded from Git LFS:

$ make compile_testcase_model TESTCASE=spawnrefsmalloffice
...
/usr/bin/ld:/home/developer/git/modelica-buildings/Buildings/Resources/Library/linux64/[libModelicaBuildingsEnergyPlus.so](http://libmodelicabuildingsenergyplus.so/): file format not recognized; treating as linker script
/usr/bin/ld:/home/developer/git/modelica-buildings/Buildings/Resources/Library/linux64/[libModelicaBuildingsEnergyPlus.so](http://libmodelicabuildingsenergyplus.so/):1: syntax error
collect2: error: ld returned 1 exit status
make[1]: *** [fmume20_] Error 1
make: *** [fmume20] Error 2
...
/usr/local/JModelica/Makefiles/MakeFile:163: recipe for target 'fmume20' failed
Unknown program error, org.jmodelica.util.exceptions.CcodeCompilationException: Compilation of generated C code failed.
C file location: /tmp/jmc807535789236270263out/sources/SpawnRefSmallOfficeBuilding.c
Traceback (most recent call last):
  File "compile_fmu.py", line 50, in <module>
    fmupath = parser.export_fmu(modelpath, [mopath])
  File "/usr/local/testing/parsing/parser.py", line 213, in export_fmu
    instances, signals = parse_instances(model_path, file_name)
  File "/usr/local/testing/parsing/parser.py", line 45, in parse_instances
    fmu_path = compile_fmu(model_path, file_name)
  File "/usr/local/JModelica/Python/pymodelica/compiler.py", line 148, in compile_fmu
    separate_process, jvm_args)
  File "/usr/local/JModelica/Python/pymodelica/compiler.py", line 257, in _compile_unit
    compiler_options, compile_to, compiler_log_level, jvm_args)
  File "/usr/local/JModelica/Python/pymodelica/compiler.py", line 378, in compile_separate_process
    return log.end();
  File "/usr/local/JModelica/Python/pymodelica/compiler_logging.py", line 332, in end
    raise CcodeCompilationError(exception.message)
pymodelica.compiler_exceptions.CcodeCompilationError: Compilation of generated C code failed.
C file location: /tmp/jmc807535789236270263out/sources/SpawnRefSmallOfficeBuilding.c
make[1]: *** [exec_jm] Error 1
make: *** [compile_testcase_model] Error 2