Revert "modified python3 to CI"

This reverts commit 2402beb6
8 jobs for development in 9 minutes and 56 seconds (queued for 47 seconds)
Status Job ID Name Coverage
  Build Gcc
passed #3600
job_make_gcc

00:01:30

 
  Test Gcc
passed #3601
job_test_gcc

00:00:20

 
  Build Gcc Nocheck
passed #3602
job_make_gcc_nocheck

00:01:19

 
  Test Gcc Nocheck
passed #3603
job_test_gcc_nocheck

00:00:20

 
  Build Python
passed #3604
job_build_python2

00:01:56

passed #3605
job_build_python3

00:01:57

 
  Build Clang
passed #3606
job_make_clang

00:02:18

 
  Test Clang
passed #3607
job_test_clang

00:00:12