Fix log message and its level.

getpwnam_r() failure is reported as LogInfo while
getgrnam_r() failure is rported as LogMajor, reduced
its level to LogInfo. Also fixed the error message
to match the failed call, getgrnam_r()

Signed-off-by: Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>
Merge branch 'tp/ibm_next_20_minorfix' into ibm_next_2Xmerge_tmp