attr: add test.sh to handle version check

The generic CI test fails for /usr/bin/attr because that binary does
not implement --version. getfattr and setfattr do, so test those for
the version string and only verify attr is present and executable.

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

utils/attr/test.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+case "$1" in
+	attr)
+		# attr does not implement --version; just verify it is present
+		[ -x /usr/bin/attr ] || exit 1
+		;;
+esac