Revamp Python regression tests suite

[elicn]

Highlights:

• All Python regression tests are now collectively managed and dispatched by a single centralized module called regress.py
  • Heavily modified most of the Python regression tests to adhere to unittest conventions
  • Added regress.logger to allow emitting logging output by log level
  • Adding new test is done simply by creating a new .py file in the same directory
  • Each test is standalone and may be ran directly
  • New test suite should support Python 2, but this was not tested

Known failures:

• Modifying x86 EFLAGS will not take effect unless re-writing EIP/RIP (jumping.py)
• Mapping memory to high addresses will fail on use rather than on map (mem_high_mapping.py)
• Unicorn will segfault when calling mem_write to write to a location that was mapped only as UC_PROT_READ (hook_readonly_write_local.py)
• Wrong exceptions raised, root cause is yet to be determined (mips_except.py)

[wtdcode]

Thanks!