[Bug 238232] [patch] sysrc ignores the -i ignore flag

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238232

            Bug ID: 238232
           Summary: [patch] sysrc ignores the -i ignore flag
           Product: Base System
           Version: 12.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: yannk at apple.com

Created attachment 204709
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=204709&action=edit
simple patch to sysrc for -i

There is no functional difference between -q and -i.

The -i flag is documented as:

   Ignore unknown variables.

The -q flag is documented as:

   Quiet.  Disable verbose and hide certain errors.  When combined
   with ‘-L’ and one or more name arguments, provide only exit
   status and no output.


The current behavior is observed:

$ sysrc unknown
sysrc: unknown variable 'unknown'
$ echo $?
1
$ sysrc -q unknown
$ echo $?
1
$ sysrc -i unknown
$ echo $?
1


When the following behavior is expected:
$ sysrc -i unknown
sysrc: unknown variable 'unknown'
$ echo $?
0

Combining with the -q flag
$ sysrc -q -i unknown
$ echo $?
0

The following patch:
- Makes -i exit code 0
- Makes -i not suppress output unless combined with -q

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