cooker: add support for using % as a wildcard in bbappend filename

There has been a continuing call for supporting wildcard in bbappend
filenames. The wildcard is actually allow matching of the name and
version up to the point of encountering the %.  This approach will
allow for matching of the major or major.minor.

Exampes:

busybox_1.21.1.bb
busybox_1.21.%.bbappend will match
busybox_1.2%.bbappend will also match

if we update to busybox_1.3.0.bb the above won't match, but a busybox_1.%.bb
will.

[YOCTO #5411]

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
HOB: Show warnings in Issues tab

Proper update of warnings view during build.

[YOCTO #3496]

Signed-off-by: Valentin Popa <valentin.popa@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
bitbake-layers: avoid loading configuration when not needed

In recent versions of bitbake, it is not possible to initialise a
BBCooker object without having it load the configuration first. Thus we
should avoid creating the Tinfoil object here in bitbake-layers which
does that internally until we actually need to, so you can run
"bitbake-layers help" and not have to wait several seconds for the
output.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>