hash: minor touchups

On RHEL5, I got:
util/virrandom.c:66: warning: nested extern declaration of '_gl_verify_function66' [-Wnested-externs]

The fix is to hoist the verify earlier.  Also some other hodge-podge
fixes I noticed while reviewing Dan's recent series.

* .gitignore: Ignore new test.
* src/util/cgroup.c: Bump copyright year.
* src/util/virhash.c: Fix typo in description.
* src/util/virrandom.c (virRandomBits): Mark doc comment, and
hoist assert to silence older gcc.

.gitignore

@@ -78,6 +78,7 @@
 /tests/openvzutilstest
 /tests/qemuxmlnstest
 /tests/shunloadtest
+/tests/virhashtest
 /update.log
 Makefile
 Makefile.in

src/util/cgroup.c

 /*
  * cgroup.c: Tools for managing cgroups
  *
- * Copyright (C) 2010-2011 Red Hat, Inc.
+ * Copyright (C) 2010-2012 Red Hat, Inc.
  * Copyright IBM Corp. 2008
  *
  * See COPYING.LIB for the License of this software

src/util/virhash.c

 /*
- * virhash.c: chained hash tables for domain and domain/connection deallocatiosn
+ * virhash.c: chained hash tables
  *
  * Reference: Your favorite introductory book on algorithms
  *

src/util/virrandom.c

@@ -46,7 +46,11 @@ int virRandomInitialize(uint32_t seed)
     return 0;
 }
 
-/*
+/* The algorithm of virRandomBits requires that RAND_MAX == 2^n-1 for
+ * some n; gnulib's random_r meets this property. */
+verify(((RAND_MAX + 1U) & RAND_MAX) == 0);
+
+/**
  * virRandomBits:
  * @nbits: Number of bits of randommess required
  *
@@ -61,10 +65,6 @@ uint64_t virRandomBits(int nbits)
     uint64_t ret = 0;
     int32_t bits;
 
-    /* This algorithm requires that RAND_MAX == 2^n-1 for some n;
-       gnulib's random_r meets this property. */
-    verify(((RAND_MAX + 1U) & RAND_MAX) == 0);
-
     virMutexLock(&randomLock);
 
     while (nbits > bits_per_iter) {