Various fixes with bsi module policy

[securitykernel]

• Add KDFs permitted/prohibited by BSI to BSI module policy
• Add ECIES, ECKCDSA to BSI module policy
• Add appropriate #ifdef around ECIES tests requiring the ISO 18033 KDF (leads to test failures if the KDF is not part of the build, as it is only a test dependency, not an implementation dependency)
• Add missing par_hash dependency to tls module
• Check for valid hash function in Handshake_Hash::final() (led to crashes in TLS <1.2 tests if par_hash is not part of the build)

With this patch, ./configure.py --module-policy=bsi --enable-modules="tls" now successfully compiles and tests run fine. Maybe we could add this configuration to CI to prevent regressions?

Updated: Removed unused kdf2 dependency from tls module (which is prohibited in BSI module policy anyway)

[codecov-io]

Current coverage is 81.84%

Merging #522 into master will decrease coverage by <.01%

@@             master       #522   diff @@
==========================================
  Files           307        307          
  Lines         23534      23537     +3   
  Methods           0          0          
  Messages          0          0          
  Branches         51         51          
==========================================
+ Hits          19264      19265     +1   
- Misses         4245       4247     +2   
  Partials         25         25          

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