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Description of problem:
# rngd --quiet
Initalizing available sources
Enabling RDRAND rng support
Enabling JITTER rng support
(same for 'rngd -q')

Version-Release number of selected component (if applicable):
rng-tools-6.3.1-1.el7.x86_64
(was okay before, rng-tool-5-15.el7 I think)

How reproducible:
100%

Steps to Reproduce:
1. rngd --quiet 
2.
3.

Actual results:
Diagnostic messages in quiet mode

Expected results:
Minimal output only (or just $ERRORLEVEL)

Additional info:

Related to Bug 1558616 - mismatch of the rngd options in help and man pages

I think this is a regression against https://bugzilla.redhat.com/show_bug.cgi?id=1558616#c4 (I think that was rng-tool-5-15.el7 , but forgot to write down the exact version)

Ok, please confirm that this build allows acts as it should.  It works for me:
 https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=17450207

Looks good to me:

# rpm -q rng-tools
rng-tools-6.3.1-2.el7.x86_64

# rngd
Initalizing available sources
Failed to init entropy source 0: Hardware RNG Device
Failed to init entropy source 1: TPM RNG Device
Enabling RDRAND rng support
Enabling JITTER rng support

# rngd --quiet

# rngd -q

# echo $?
0

Looks good in RHEL-7.6-20180801.n.0 Server x86_64 :

# rpm -q rng-tools
rng-tools-6.3.1-2.el7.x86_64

# rngd
Initalizing available sources
Failed to init entropy source 0: Hardware RNG Device
Failed to init entropy source 1: TPM RNG Device
Enabling RDRAND rng support
Enabling JITTER rng support

# killall rngd

# rngd -q

# killall rngd

# rngd --quiet

#

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3022