yocto/packet-analyzer-native: Migrate to setuptools and oe-run-native

To simplify the invocation of the Packet Analyzer, use setuptools
entrypoint scripts for the package so that the scripts are
automatically installed in /usr/bin in the recipe-sysroot-native.

For the dependency on packet-analyzer-native, use
do_addto_recipe_sysroot so that it is added to packet-analyzer-native's
own recipe-sysroot-native when an image is built. Limiting this
dependency to 'baremetal' and 'virtualization', else multiconfig build
for 'Virtualization' will create recipe sysroot for dom0 and domu1.

In the user guide, use the "oe-run-native" script in OE-core to invoke
the start_analyzer script of the packet-analyzer-native's
recipe-sysroot-native.

Modify the oeqa test case to call start_analyzer directly.

Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com>
Signed-off-by: Vineeth Raveendran <vineeth.raveendran@arm.com>