images: Inherit from core-image-base

We really do not need to define base images which already exist in core
layer, reuse them here.

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-core/images/meta-python-image.bb

@@ -1,4 +1,4 @@
-require  meta-python-image-base.bb
+require recipes-core/images/core-image-base.bb
 
 SUMMARY = "meta-python build test image"
 

meta-python/recipes-core/images/meta-python-ptest-image.bb

@@ -1,10 +1,9 @@
 inherit features_check
 REQUIRED_DISTRO_FEATURES = "ptest"
 
+require recipes-core/images/core-image-base.bb
 require conf/include/ptest-packagelists-meta-python.inc
 
-require  meta-python-image-base.bb
-
 SUMMARY = "meta-python ptest test image"
 
 DESCRIPTION += "Also including the ${MCNAME} ptest package."