bitbake: toaster: format packages with size = -1

bitbake: toaster: format packages with size = -1

Packages that have a size of -1 are virtual packages with limited
information.  Such packages should be suppressed from the package
list page for an image.  On dependency and reverse dependency lists of
package, such packages should appear in muted rows, without links,
and with help information.

The formatting rules are encapsulated into projecttags filters when
possible to minimize tests on size==-1 in the templates.

Testing the relevant pages with an HTML5 validator found a stray end
tag in package_detail_base which has been fixed in this commit.

[YOCTO #5966]

(Bitbake rev: 6cdd4067f766ef5680076c33a32b2dc5d622362c)

Signed-off-by: Dave Lerner <dave.lerner@windriver.com>
Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>