Fix missing python import in extract_qmtest_metadata.py

In the ongoing process of trying to build the Gaudi master on Ubuntu 14.04, I noticed that I got plenty of python crashes in my CMake logs :

Traceback (most recent call last):
  File "/home/hadrien/Bureau/Gaudi/cmake/extract_qmtest_metadata.py", line 130, in <module>
    analyze_disabling(*sys.argv[1:])
  File "/home/hadrien/Bureau/Gaudi/cmake/extract_qmtest_metadata.py", line 109, in analyze_disabling
    platform.platform())
NameError: global name 'platform' is not defined
CMake Warning at cmake/GaudiProjectConfig.cmake:2323 (message):
  failure computing dependencies of QMTest tests
Call Stack (most recent call first):
  GaudiSvc/CMakeLists.txt:36 (gaudi_add_test)

As it turns out, this script tries to uses the python stdlib module "platform" in function "analyze_disabling" without importing it first. Fixing this is as simple as adding an "import platform" to the beginning of the file.

Title changed from Fix missing import for module platform (used in function analyze_disabling()) to Fix missing python import in extract_qmtest_metadata.py

Milestone changed to v27r1

Reassigned to @clemenci

Well spot.

I never noticed it because I always have either BINARY_TAG or CMTCONFIG defined, so the code never needs to fall back to the platform module.

mentioned in commit a2a8c1ce

Status changed to merged