#3311 imm: PBE logging inconsistent

[Thang Duc Nguyen]

There are some logging in syslog for PBE but they are inconsistent. It's not easy for troubleshooting.
E.g,
- LOG_WA("Persistent back-end process has apparently died.");
- LOG_NO( "Persistent Back-End capability configured, Pbe file:%s (suffix may get added)",
immnd_cb->mPbeFile);
- LOG_NO("Persistent Back End OI attached, pid: %u", pbe_pid);
- LOG_ER("IMM RELOAD with NO persistent back end => ensure cluster restart by IMMD exit at both SCs, exiting");
.etc,

Should make they consistent.

[Vu Minh Hoang]

imm: fix PBE logging inconsistent [#3311]

There are some logging syslog for PBE but they are inconsistent make it hard to troubleshooting
E.g,
- LOG_ER("IMM RELOAD with NO persistent back end => ensure cluster restart by IMMD exit at both SCs, exiting");
- TRACE_5("ERR_TRY_AGAIN: Persistent back end is down");
- TRACE("Persistent Back-End OI %s is attaching",...);
Solution is to make all of them to Persistent Back End.