Integrate Unittests from UnitTest Repository into this repository on the fly

[sidey79]

• Please check if the PR fulfills these requirements

• Tests for the changes have been added / modified (needed for for bug fixes / features)
• commandref has been added / updated (needed for bug fixes / features)
• CHANGED has been updated (needed for bug fixes / features)

• What kind of change does this PR introduce?

Feature:
After moving the UnitTest module into a seperate repository, this caused some changes to get it working.

This Project now has a makefile (make test) which is running tests against modules included here.

1. Downloads a makefile from the UnitTest Repostory
2. Copy unittest specific libs and json files into the correct directory under /opt/fhem
3. call make to run tests with options PERL_OPTS="-MDevel::Cover" (uses makefile from the UnitTest Repostory)
   a) This will again copy standard module files to the correct locations under /opt/fhem
   b) Restart fhem with special unittest configuration
   c) Runs every testfile which is located unter RFFHEM\UnitTest\tests and fulfills naming policy.
   d) stops fhem

• What is the current behavior? (You can also link to an open issue here)

A copy of the unittest module resides static in our repository. Updates must be added manually.
The project makefile runs test only explicit specified testfiles.

• What is the new behavior (if this is a feature change)?

The unittest module (with all needed files) is downloaded from the unittest repository before starting a test.
The project makefile in this project is minimalistic, because it triggers the makefile from the unittest repository which is more complex but independend from the specific tests.

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

No breaking change known, maybe modified testfiles must be matched to the new location

• Other information:

This PR will use the makefile from the UnitTest repository for running tests. So the local makefile is reduced to a few lines.

[sidey79]

ich warte mit dem Merge auf #554 und #550 wegen Anpassungen

[coveralls]

Pull Request Test Coverage Report for Build 1410

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at ?%

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Totals
Change from base Build 1408:	0.0%
Covered Lines:
Relevant Lines:	0

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💛 - Coveralls

[sidey79]

@HomeAutoUser
Sodele, der PR ist nun konfliktfrei

[HomeAutoUser]

Wieder da in der OnlineWelt :D
Ich schaue es mir heute Daheim an.

[sidey79]

@HomeAutoUser
hattest Du schon Gelegenheit es mal anzusehen?

[HomeAutoUser]

mir fiehl erstmal nichts weiter auf