bitbake: toaster: add rev dep column to image detail pages

Add a column to the custom image pages that shows the reverse
dependencies in a format matching the dependencies column:
  - either blank or a button showing the count of reverse dependencies,
  - when the button is clicked, a popover appears showing the list
    of reverse dependencies, with each package's size, and the total
    size of all of the reverse dependencies.

The implementation adds a packages table method to retreive the reverse
dependency total size, and adds a separate 'popover' html template. Both
of these changes follow the pattern for the dependencies column.

[YOCTO #9163]

(Bitbake rev: 2f978dccaa1ec82c7ad350bdc1cd9500000984eb)

Signed-off-by: Dave Lerner <dave.lerner@windriver.com>
Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/orm/models.py

@@ -822,6 +822,13 @@ class Package_DependencyManager(models.Manager):
         """
         return self.all().aggregate(Sum('depends_on__size'))
 
+    def get_total_revdeps_size(self):
+        """ Returns the total file size of all the packages that depend on
+        this package.
+        """
+        return self.all().aggregate(Sum('package_id__size'))
+
+
     def all_depends(self):
         """ Returns just the depends packages and not any other dep_type """
         return self.filter(Q(dep_type=Package_Dependency.TYPE_RDEPENDS) |