disable more features when using 'git format-patch'

In my .gitconfig I have this:

  [format]
          useAutoBase = true
          thread = shallow

As a consequence, when I run generate-patches-from-git-repo.sh I see
two problems, first, I see lots of errors like this:

  fatal: failed to get upstream, if you want to record base commit automatically,
  please use git branch --set-upstream-to to track a remote branch.
  Or you could specify base commit by --base=<base-commit-id> manually

These are caused by the use of the useAutoBase option.

If I disable useAutoBase, and regenerate the patches, I see that every
patch changes, with the addition of a line like this:

  Message-Id: <some message id string here...>

This is caused by the use of the thread option.

Rather than forcing me to not have these settings in my .gitconfig, I
propose that we add --no-base and --no-thread to our invocation of
'git format-patch' in generate-patches-from-git-repo.sh, this fixes
both of the above problems.

With these new options the 'git format-patch' line was getting pretty
long, so I've wrapped it to make it more readable.

generate-patches-from-git-repo.sh

@@ -83,7 +83,10 @@ for c in `git rev-list --reverse ${common_ancestor}..HEAD` ; do
     # before, even if nothing has changed.  This is bad, so we replace
     # the commit hash by something constant (the string
     # "FEDORA_PATCHES").
-    git format-patch --no-signature --no-stat --keep-subject -1 --stdout $c | sed -e '1 s/^From [0-9a-f]\+ \(.*\)/From FEDORA_PATCHES \1/' -e '/^index [0-9a-f]\+\.\.[0-9a-f]\+.*$/d' > $orig_dir/$fname
+    git format-patch --no-base --no-thread --no-signature --no-stat \
+        --keep-subject -1 --stdout $c \
+        | sed -e '1 s/^From [0-9a-f]\+ \(.*\)/From FEDORA_PATCHES \1/' \
+              -e '/^index [0-9a-f]\+\.\.[0-9a-f]\+.*$/d' > $orig_dir/$fname
     (cd $orig_dir && git add $fname)
 
     cat >> $temp_PATCH_file <<EOF