all: Don't use 'grep -q'

It's not portable.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>

libvirt.spec.in

@@ -281,7 +281,7 @@ Release: 1%{?dist}
 License: GPL-2.0-or-later AND LGPL-2.1-only AND LGPL-2.1-or-later AND OFL-1.1
 URL: https://libvirt.org/
 
-%if %(echo %{version} | grep -q "\.0$"; echo $?) == 1
+%if %(echo %{version} | grep "\.0$" >/dev/null; echo $?) == 1
     %define mainturl stable_updates/
 %endif
 Source: https://download.libvirt.org/%{?mainturl}libvirt-%{version}.tar.xz

tests/virsh-uriprecedence

@@ -15,7 +15,7 @@ mock_xdg_ || framework_failure
 
 is_uri_good()
 {
-    echo "$1" | grep -q -F "$good_uri"
+    echo "$1" | grep -F "$good_uri" >/dev/null
 }
 
 test_uri_internal()

tests/virt-aa-helper-test

@@ -139,7 +139,7 @@ testme() {
 
     rule_missing=0
     if [ -n "$checkrule" ]; then
-        if ! grep -q "$checkrule" "$tmpout"; then
+        if ! grep "$checkrule" "$tmpout" >/dev/null; then
             echo "FAIL: missing rule '$checkrule'" >"$output"
             rule_missing=1
         fi