Convert to new override syntax

This is the result of automated script (0.9.1) conversion:

oe-core/scripts/contrib/convert-overrides.py .

converting the metadata to use ":" as the override character instead of "_".

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-python/recipes-devtools/python/python3-pexpect_4.8.0.bb

@@ -13,7 +13,7 @@ inherit pypi setuptools3
 
 UPSTREAM_CHECK_URI = "https://pypi.python.org/pypi/pexpect"
 
-RDEPENDS_${PN} = "\
+RDEPENDS:${PN} = "\
     ${PYTHON_PN}-core \
     ${PYTHON_PN}-io \
     ${PYTHON_PN}-terminal \