lib/oe/rootfs: Use list_pkgs() instead of list()

This patch changes the use list_pkgs() instead of list()
from class RpmPkgsList. The change is in two functions,
image_list_installed_packages from rootfs.py and
sdk_list_installed_packages from sdk.py.

With this change the functions calling the functions
listed above, must format the output as they required.
The formatting can be done using format_pkg_list() from
oe.utils.

The classes calling the afected functions are changed too
with this patch, to keep the same functionality using the
new data structure.

[YOCTO #7427]

(From OE-Core rev: 983ea373362514e5888bd1d7d9c4f136c94b00f2)

Signed-off-by: Mariano Lopez <mariano.lopez@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/license.bbclass

@@ -21,8 +21,12 @@ python write_package_manifest() {
     license_image_dir = d.expand('${LICENSE_DIRECTORY}/${IMAGE_NAME}')
     bb.utils.mkdirhier(license_image_dir)
     from oe.rootfs import image_list_installed_packages
+    from oe.utils import format_pkg_list
+
+    pkgs = image_list_installed_packages(d)
+    output = format_pkg_list(pkgs)
     open(os.path.join(license_image_dir, 'package.manifest'),
-        'w+').write(image_list_installed_packages(d))
+        'w+').write(output)
 }
 
 python write_deploy_manifest() {
@@ -38,7 +42,7 @@ python license_create_manifest() {
         return 0
 
     pkg_dic = {}
-    for pkg in image_list_installed_packages(d).splitlines():
+    for pkg in sorted(image_list_installed_packages(d)):
         pkg_info = os.path.join(d.getVar('PKGDATA_DIR', True),
                                 'runtime-reverse', pkg)
         pkg_name = os.path.basename(os.readlink(pkg_info))