first init for credibility
rename credibility to tdm, seems conflicting with struct cred
step1: add tdm xattr
step1: init tdm xattr
step1: almost finished
step1: update makefile and kconfig
step1: update tdm.h
step1: compilation ok
step1: add debug info
step2: init degree updating hook function
step2: place hook function into ima for test
step2: mv hook to process_measurement
step2: bug fix, almost finished
Merge branch 'trust-degree'

Conflicts:
	security/integrity/ima/ima_main.c