protobuf: make python-protobuf dependency optional and default to off

A dependency on python-protobuf was added in commit
5f6fcfd36272768a3ff9078c07c572cf5dc01ccd for the sole purpose of
providing a ptest, however python-protobuf is in meta-python and thus
this means that meta-oe would depend on meta-python by default (assuming
your distro enables ptest by default), and we don't want that - meta-oe
isn't supposed to depend upon any layer other than openembedded-core.
Luckily we can still have a ptest even without the python support, so
add a PACKAGECONFIG and leave it disabled by default.

Note: the PACKAGECONFIG here is not particularly useful since it's only
about what goes into the -ptest package and thus also the dependency. I
contemplated just using LANG_SUPPORT instead, but PACKAGECONFIG does
have the advantage that it's introspectable and fairly well understood
so in the end I went with it.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

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