hush: fix "while false; ..." exitcode; add testsuites

shell/hush_test/hush-misc/break4.right

@@ -0,0 +1,6 @@
+A
+AA
+TRUE
+A
+AA
+OK:0

shell/hush_test/hush-misc/break4.tests

@@ -0,0 +1,12 @@
+cond=true
+while $cond; do
+    echo A
+    if test "$cond" = true; then
+	cond='echo TRUE'
+    else
+	cond=false
+    fi
+    while true; do echo AA; continue 2; echo BB; done
+    echo B
+done
+echo OK:$?

shell/hush_test/hush-misc/while1.right

@@ -0,0 +1 @@
+OK:0

shell/hush_test/hush-misc/while1.tests

@@ -0,0 +1,2 @@
+while false; do echo NOT SHOWN; done
+echo OK:$?