Use a TPM simulator for the integration tests

[diabonas]

Add a simple test harness to automatically start and use a TPM simulator for the integration tests. This is possible by using the TCTI environment variable introduced in #62, which is now enabled by default for this reason.

This has the following advantages:

• Integration tests will run out of the box on any system.
• There is no danger of clobbering data on an existing TPM.
• The tests can be run in parallel.
• The integration test scripts can be simplified because the environment configuration is done globally in the test harness.

Additionally this PR fixes #106 (upstream renaming of tpm2-tools options).

Closes #86

[codecov[bot]]

Codecov Report

Merging #107 into master will increase coverage by 4.69%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
+ Coverage   62.73%   67.43%   +4.69%     
==========================================
  Files           9        9              
  Lines        1170     1176       +6     
==========================================
+ Hits          734      793      +59     
+ Misses        436      383      -53

Impacted Files	Coverage Δ
src/tpm2-tss-engine.c	58.73% <0%> (+0.39%)	:arrow_up:
src/tpm2-tss-engine-tcti.c	58.67% <0%> (+45.45%)	:arrow_up:

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