Convert util/mkrel to use git instead of svn

(cherry picked from commit 933798d)

Update CHANGES file generation for Git

Use the correct git log invocation for generating the CHANGES file.
(cherry picked from commit 6d204bc)

Make mkrel work on non-master branches

Appending "--" to the git checkout arguments appears to prevent it
from automatically creating a local branch from the remote.  Also
correct the default git URL and clean up a spurious find warning.
(cherry picked from commit 4fc9c72)

src/util/mkrel

@@ -1,6 +1,6 @@
 #!/bin/sh
 set -e
-repository=svn+ssh://svn.mit.edu/krb5
+repository=git.mit.edu:/git/krb5.git
 dodoc=t
 dosrc=t
 checkout=t
@@ -94,31 +94,25 @@ echo "major=$relmajor minor=$relminor patch=$relpatch"
 # $reltag, $release, $reldate are used for brand.c currently
 # $relmajor, $relminor, $relpatch are used for patchlevel.h currently
 
+if test $checkout = t; then
+	echo "Checking out krb5 with tag $reltag into directory $reldir..."
+	git clone -q -n $repository $reldir
+	(cd $reldir && git checkout -q $reltag)
+fi
+
 #
 # $newstyle = t if patchlevel.h is the master version stamp file.  If
 # so, we don't edit it here.
 #
-if test $checkout = t; then
-	if svn cat $repository/$reltag/src/patchlevel.h | grep KRB5_RELDATE > /dev/null 2>&1; then
-		newstyle=t
-	else
-		newstyle=nil;
-	fi
+if grep KRB5_RELDATE $reldir/src/patchlevel.h > /dev/null 2>&1; then
+	newstyle=t;
 else
-	if grep KRB5_RELDATE $reldir/src/patchlevel.h > /dev/null 2>&1; then
-		newstyle=t;
-	else
-		newstyle=nil;
-	fi
+	newstyle=nil;
 fi
 
 if test $newstyle = t; then
 	echo "parsing new style patchlevel.h..."
-	if test $checkout = t; then
-		eval `svn cat $repository/$reltag/src/patchlevel.h | sed -n 's/#define \([A-Z0-9_]*\)[ \t]*\(.*\)/\1=\2/p'`
-	else
-		eval `sed -n 's/#define \([A-Z0-9_]*\)[ \t]*\(.*\)/\1=\2/p' < $reldir/src/patchlevel.h`
-	fi
+	eval `sed -n 's/#define \([A-Z0-9_]*\)[ \t]*\(.*\)/\1=\2/p' < $reldir/src/patchlevel.h`
 	if test "$KRB5_RELTAG" != $reltag && \
 		test "$KRB5_RELTAG" != `echo $reltag|sed 's%[^/]*/%%'` ; then
 		echo "WARNING: patchlevel.h '$KRB5_RELTAG' != $reltag"
@@ -135,11 +129,6 @@ else
 	echo "old style patchlevel.h"
 fi
 
-if test $checkout = t; then
-	echo "Checking out krb5 with tag $reltag into directory $reldir..."
-	svn export $repository/$reltag $reldir
-fi
-
 echo "Editing release-specific files..."
 
 if test $newstyle = t; then 
@@ -148,7 +137,7 @@ if test $newstyle = t; then
 #define KRB5_RELDATE "'"$reldate"'"' patchlevel.h > patchlevel.h.new && \
 		mv patchlevel.h.new patchlevel.h)
 	if test $checkout = t; then
-		(cd $reldir && svn log -v $repository/$reltag > doc/CHANGES)
+		(cd $reldir && git log --stat $reltag > doc/CHANGES)
 	fi
 else
 
@@ -188,10 +177,11 @@ fi
 
 echo "Nuking unneeded files..."
 find $reldir \( -name TODO -o -name todo -o -name .cvsignore \
-	-o -name BADSYMS -o -name .Sanitize -o -name .rconf \) -print \
-	| xargs rm -f || true
-find $reldir -type d \( -name autom4te.cache -o -name .svn \
+	-o -name .gitignore -o -name BADSYMS -o -name .Sanitize \
+	-o -name .rconf \) -print | xargs rm -f || true
+find $reldir -type d \( -name autom4te.cache \
 	-o -name \$ac_config_fragdir \) -exec rm -rf {} \; || true
+rm -rf $reldir/.git || true
 
 if test $dodoc = t; then
 	echo "Building doc..."