Journal logger backend fixes
Journal logger backend fixes

[Bug/Feature]   Some journal fields are incorrectly generated
[Cause]         N/A
[Solution]      - make PRIORITY values compatible with syslog
                - repair CODE_* fields by proper use of macro
                  SD_JOURNAL_SUPPRESS_LOCATION
[Verification]  Build, install, run server, check the result of:
                journalctl -o json-pretty _COMM=security-contai

Change-Id: I8904649ba1e40152346ba986c58f9dcb788bc94d

Samsung/vasum,Samsung/vasum,Samsung/vasum,Samsung/vasum