do not use UID hack for tester

It's causing "root-tester namesis" (both have UID 0) if the tty is owned
by root.  To fix bash test, use Expect to spawn a new PTY for it.

appendices/dependencies.xml

@@ -218,7 +218,7 @@
       <segmentedlist id="bash-testdeps">
         <segtitle>&testsuites;</segtitle>
         <seglistitem>
-          <seg>Shadow</seg>
+          <seg>Expect and Shadow</seg>
         </seglistitem>
       </segmentedlist>
 

chapter07/createfiles.xml

@@ -175,7 +175,7 @@ EOF</userinput></screen>
   user. We add this user here and delete this account at the end of that
   chapter.</para>
 
-<screen><userinput>echo "tester:x:$(ls -n $(tty) | cut -d" " -f3):101::/home/tester:/bin/bash" &gt;&gt; /etc/passwd
+<screen><userinput>echo "tester:x:101:101::/home/tester:/bin/bash" &gt;&gt; /etc/passwd
 echo "tester:x:101:" &gt;&gt; /etc/group
 install -o tester -d /home/tester</userinput></screen>
 

chapter08/bash.xml

@@ -76,8 +76,8 @@
     <para>Now, run the tests as the <systemitem
     class="username">tester</systemitem> user:</para>
 
-<screen><userinput remap="test">su tester &lt;&lt; EOF
-PATH=$PATH make tests &lt; $(tty)
+<screen><userinput remap="test">su -s /usr/bin/expect tester &lt;&lt; EOF
+spawn make tests; expect EOF;
 EOF</userinput></screen>
 
     <para>Install the package:</para>