open_posix_testsuite: initial version extracted from LTP

Compared with the LTP version, following changes are introduced:
	* Comment out the .gitignore
	* Run scripts/generate-makefiles.sh to generate all the Makefiles.
	  Need the Makefiles to customize the build.
Merge branch 'master' of https://github.com/nloopa/open_posix_testsuite
merge with initial github version to sync