Software show change related to Patched ISO

This commit add the prepatched_iso field to software show
<release> command.

Test Plan:
PASS: Software show <release> indicates it's prepatched iso.

Depends-On: https://review.opendev.org/c/starlingx/root/+/926113

Story: 2010676
Task: 50809

Change-Id: Ibb6402aa19c622f1c578f46e3d2978e1cf152a5f
Signed-off-by: Luis Eduardo Bonatti <LuizEduardo.Bonatti@windriver.com>

software/service-files/starlingx-GA-metadata.xml

@@ -10,6 +10,7 @@
   <status>REL</status>
   <unremovable>Y</unremovable>
   <reboot_required>Y</reboot_required>
+  <prepatched_iso>N</prepatched_iso>
   <apply_active_release_only/>
   <contents>
     <ostree>

software/software/release_data.py

@@ -158,6 +158,10 @@ class SWRelease(object):
     def reboot_required(self):
         return self._get_by_key('reboot_required') == "Y"
 
+    @property
+    def prepatched_iso(self):
+        return self._get_by_key('prepatched_iso') == "Y"
+
     @property
     def requires_release_ids(self):
         return self._get_by_key('requires') or []
@@ -255,6 +259,7 @@ class SWRelease(object):
                 "install_instructions": self.install_instructions,
                 "warnings": self.warnings,
                 "reboot_required": self.reboot_required,
+                "prepatched_iso": self.prepatched_iso,
                 "requires": self.requires_release_ids[:],
                 "packages": self.packages[:]}
         return data

software/software/software_functions.py

@@ -365,6 +365,13 @@ class ReleaseData(object):
         else:
             self.metadata[release_id]["reboot_required"] = "N"
 
+        # Default prepatched_iso to N
+        prepatched_iso = root.findtext("prepatched_iso")
+        if prepatched_iso is None or prepatched_iso != "Y":
+            self.metadata[release_id]["prepatched_iso"] = "N"
+        else:
+            self.metadata[release_id]["prepatched_iso"] = "Y"
+
         release_sw_version = utils.get_major_release_version(
             self.metadata[release_id]["sw_version"])
         global package_dir