python3-test-generator: drop recipe

python3-nose still contains Python 2 code which causes errors in
do_compile when using bdist_wheel or PEP-517 packaging.

Like nose, test-generator has not been touched since 2016.

Drop this recipe unless someone fixes the issues in python3-nose

[YOCTO #14638]

Signed-off-by: Tim Orling <tim.orling@konsulko.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>

meta-python/recipes-core/packagegroups/packagegroup-meta-python.bb

@@ -424,7 +424,6 @@ RDEPENDS:packagegroup-meta-python3 = "\
     python3-tabulate \
     python3-term \
     python3-termcolor \
-    python3-test-generator \
     python3-textparser \
     python3-texttable \
     python3-thrift \
@@ -535,7 +534,6 @@ RDEPENDS:packagegroup-meta-python3-ptest = "\
     python3-smpplib-ptest \
     python3-soupsieve-ptest \
     python3-sqlparse-ptest \
-    python3-test-generator-ptest \
     python3-typeguard-ptest \
     python3-ujson-ptest \
     python3-u-msgpack-python-ptest \