lib/oe/package_manager: Use with to control file handle lifetime

(From OE-Core rev: e3e86d6683e305865c9fd171c6081aec037d9870)

Signed-off-by: Ola x Nilsson <olani@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/package_manager.py

@@ -298,7 +298,7 @@ class DpkgIndexer(Indexer):
                 release.write("Label: %s\n" % arch)
 
             cmd += "PSEUDO_UNLOAD=1 %s release . >> Release" % apt_ftparchive
-            
+
             index_cmds.append(cmd)
 
             deb_dirs_found = True
@@ -655,7 +655,7 @@ def create_packages_dir(d, subrepo_dir, deploydir, taskname, filterbydependencie
     pn = d.getVar("PN")
     seendirs = set()
     multilibs = {}
-   
+
     bb.utils.remove(subrepo_dir, recurse=True)
     bb.utils.mkdirhier(subrepo_dir)
 
@@ -1006,8 +1006,8 @@ class RpmPM(PackageManager):
     def load_old_install_solution(self):
         if not os.path.exists(self.solution_manifest):
             return []
-
-        return open(self.solution_manifest, 'r').read().split()
+        with open(self.solution_manifest, 'r') as fd:
+            return fd.read().split()
 
     def _script_num_prefix(self, path):
         files = os.listdir(path)