Simplify logfile name encoding.
* init/job_process.c: job_process_log_path(): Ditch D-Bus job name
encoding in path names for saner approach that simply remaps slash
characters (minimal surprises for users).
* init/job_process.h: Addition of macros:
- JOB_PROCESS_LOG_FILE_EXT
- JOB_PROCESS_LOG_REMAP_FROM_CHAR
- JOB_PROCESS_LOG_REMAP_TO_CHAR
* init/man/init.5: Update console section for simplified log filename
encoding approach.
* init/test_job_process.c: test_log_path(): Updates for simplified
logfile name encoding.
* util/tests/test_user_sessions.sh: Updates for simplified
logfile name encoding: removed dbus_encode() and replaced with
upstart_encode().