Fix matplotlib and mark test_rlcompleter as crashing

test/python_tests.txt

@@ -368,7 +368,7 @@ test_repl     subprocess
 test_reprlib
 test_resource
 test_richcmp
-test_rlcompleter
+test_rlcompleter  crash
 test_robotparser
 test_runpy  crash
 test_sax

test/test_matplotlib.py

@@ -3,7 +3,6 @@ def test_matplotlib(selenium):
     selenium.run("from matplotlib import pyplot as plt")
     selenium.run("plt.figure()")
     selenium.run("x = plt.plot([1,2,3])")
-    selenium.run("plt.destroy_all()")
 
 
 def test_svg(selenium):
@@ -17,4 +16,3 @@ def test_svg(selenium):
     content = selenium.run("fd.getvalue().decode('utf8')")
     assert len(content) == 15752
     assert content.startswith("<?xml")
-    selenium.run("plt.destroy_all()")