Add a fake getent for tests

Avoid tests fail due to existing default user on system. There are more
than one test that is affected of this, so create a fake getent for all.

ref: https://gitlab.alpinelinux.org/alpine/cloud/tiny-cloud/-/issues/42

tests/bin/getent

@@ -0,0 +1,2 @@
+#!/bin/sh
+exit 2

tests/init.test

@@ -120,10 +120,6 @@ enable_sshd_body() {
 }
 
 create_default_user_body() {
-	fake_bin getent <<-EOF
-		#!/bin/sh
-		exit 2
-	EOF
 	atf_check \
 		-o match:"addgroup alpine" \
 		-o match:"adduser.*alpine" \