[Toaster] [review request V2] toaster: add rev dep column to image detail pages

[Dave Lerner]

COMMENT: Version 2 has a correct comment to pkg_...popover.html

Poky Contrib Branch:  None for this change, use patches
Target Branches: toaster-next master
Defect: 9163
Summary: toaster: add rev dep column to image detail pages

Commit
------
dc53c25 toaster: add rev dep column to image detail pages
 
 bitbake/lib/toaster/orm/models.py                         |  7 +++++++
 bitbake/lib/toaster/toastergui/tables.py                  |  6 ++++++
 .../templates/snippets/pkg_revdependencies_popover.html   | 15 +++++++++++++++
 3 files changed, 28 insertions(+)

Tests
-----
create myproject
New Custom Image
    name it myminimal, 
    base it on core-image-minimal
    build it

All Projects| Custom Images| myminimal
    verfiy that "Reverse dependencies" column does NOT appear
    verify that "Reverse dependencies" column can be added 
Enable "Reverse dependencies" column
    verify that some of the packages show a button in the reverse
        dependency column similar to dependencies containing the number
        of reverse dependencies.
Enter glibc on the customise image screen
Click on the count button in Rev Dep column
    verify a pop-up appears saying
        glibc reverse dependencies - 2.5 MB
    with a list of 9 packages, adding up to 2.5 MB in size 
        busybox, eudev, libkmod, sysvinit, sysvinit-pidof, util-linux-libblkid,
        util-linux-libuuid, v86d, zlib

All Builds | myminimal | Packages
Enter glibc | click on glibc | Reverse Runtime dependencies
    Verify names, count, sizes match the custom image page results above.

All Projects | Custom images | myminimal
In the About myminimal panel, click core-image-minimal
Build it as requested
Now repeat...
All Projects | Custom images | myminimal
In the About myminimal panel, click core-image-minimal
    Verify that Reverse Dependencies does NOT appear
Click Edit columns | check Reverse dependencies
    Verify Reverse Depencency column appears
Enter glibc | click on the Rev. Dep. column
    Verify count, names, size are as shown on the Add | Remove page
END TESTS