Trac #19085: Remove test for scons from sage/tests/cmdline.py

scons is now an optional package only pulled by `polybori` once
`polybori` is replaced by `brial` in #18437 new sage install won't have
`scons` installed and doctest for `scons` functionality will fail.

This ticket remove the tests for `scons` which should have been removed
when it was made optional.

URL: http://trac.sagemath.org/19085
Reported by: fbissey
Ticket author(s): François Bissey
Reviewer(s): Jeroen Demeyer

src/sage/tests/cmdline.py

@@ -37,7 +37,6 @@
 --root
 --rst2txt
 --rst2sws
---scons
 --sh
 --singular
 --sqlite3
@@ -574,14 +573,6 @@ def test_executable(args, input="", timeout=100.0, **kwds):
         sage: ret
         0
 
-        sage: (out, err, ret) = test_executable(["sage", "--scons", "--version"])
-        sage: out.find("SCons") >= 0
-        True
-        sage: err
-        ''
-        sage: ret
-        0
-
         sage: (out, err, ret) = test_executable(["sage", "--sqlite3", "--version"])
         sage: out.startswith("3.")
         True