Change AlertSeverity to Severity in policy/engine

Updated logback xml files, replacing AlertSeverity with Severity.
Also fixed some spacing issues.

Change-Id: I3e4b9163d5d897fe4402028b69c741f497aecfc5
Issue-ID: POLICY-1989
Signed-off-by: Jim Hahn <jrh3@att.com>
8 files changed