edit-node: fix some cmds to work

Previously the follow cmds didn't work when
creating post-image processing manifests:
cmd = "LC_ALL=C rpm -qa --qf '%{name}-%{version}-%{release}.'" + \
            "'%{arch} (%{SIGPGP:pgpsig})\n' | sort -u > /manifest-" + \
            "%s-%s-rpm.txt" % (timestamp, pkg)
cmd = "LC_ALL=C rpm -qa --qf '%%{sourcerpm}\n' | sort -u > " + \
            "/manifest-%s-%s-srpm.txt" % (timestamp, pkg)
cmd = "LC_ALL=C rpm -qa --qf '%%{license}\n' | sort -u > " + \
            "/manifest-%s-%s-license.txt" % (timestamp, pkg)
cmd = "rpm -q %s --qf '%%{version}-%%{release}.%%{arch}\n'" \
                  % pkg
cmd = "LC_ALL=C rpm -q %s --qf '%%{INSTALLTIME:date}\n'" \
                  % pkg

Now they can work.

Signed-off-by: hadong <hadong0720@gmail.com>
Change-Id: Ic8160c9590a3309700a11c6ba2ae1c77b9861641