Simplify compileall checks. Remove py3 skip list.

lib/ansible/modules/test/utils/shippable/sanity-skip-python24.txt

@@ -1 +1 @@
-/cloud/
+/cloud/[^/]+/(?!(ec2_facts.py|_ec2_ami_search.py))

lib/ansible/modules/test/utils/shippable/sanity-test-python24.txt

@@ -1,2 +0,0 @@
-cloud/amazon/_ec2_ami_search.py
-cloud/amazon/ec2_facts.py

lib/ansible/modules/test/utils/shippable/sanity.sh

@@ -29,11 +29,10 @@ fi
 
 validate_modules="${build_dir}/test/sanity/validate-modules/validate-modules"
 
-python2.4 -m compileall -fq   -i                    "test/utils/shippable/sanity-test-python24.txt"
 python2.4 -m compileall -fq   -x "($(printf %s "$(< "test/utils/shippable/sanity-skip-python24.txt"))" | tr '\n' '|')" .
 python2.6 -m compileall -fq .
 python2.7 -m compileall -fq .
-python3.5 -m compileall -fq . -x "($(printf %s "$(< "test/utils/shippable/sanity-skip-python3.txt"))"  | tr '\n' '|')"
+python3.5 -m compileall -fq .
 
 ANSIBLE_DEPRECATION_WARNINGS=false \
     "${validate_modules}" --exclude '/utilities/|/shippable(/|$)' .