Change owner/group of all files in /var/log/keystone after initializing PKI

Because the log file for keystone is keystone-all.log on openSUSE we should
not use the filename to be distribution independent.

Change-Id: I2eb2735edc61b81299004109db0304fae8417197
Merge "Change owner/group of all files in /var/log/keystone after initializing PKI"