Info: make builddir add owner write permissions to all files

Since bcfg2-info isn't normally run as root, it can remove write
permissions from itself in certain situations.  This patch ensures
that owner write is added to the mode for all files written by
builddir.

For example, suppose a bundle specifies a file /etc/foo/private
with mode 0444.  The POSIX tool will create /etc/foo with mode
0555.  Any subsequent files that are specified to exist in
/etc/foo will not be created because bcfg2-info will hit a
permission denied error.

src/sbin/bcfg2-info

@@ -10,6 +10,7 @@ import fnmatch
 import logging
 import lxml.etree
 import traceback
+import stat
 from code import InteractiveConsole
 import Bcfg2.Logger
 import Bcfg2.Options
@@ -280,6 +281,9 @@ Bcfg2 client itself.""")
                 for entry in struct:
                     if entry.tag == 'Path':
                         entry.set('name', odir + '/' + entry.get('name'))
+                        if entry.get('mode') != None:
+                            entry.set('mode', \
+                                oct(int(entry.get('mode'), 8)|stat.S_IWUSR))
 
             posix = Bcfg2.Client.Tools.POSIX.POSIX(MockLog(),
                                                    self.setup,