Fix flaky subtest f2fsslower in test_tools_smoke.py (iovisor#3531)

The f2fsslower.py may return earlier if the kernel does not
have required functions. For example, on my system,

  $ sudo python3.6 ./f2fsslower.py
  ERROR: no f2fs_file_operations in /proc/kallsyms. Exiting.
  HINT: the kernel should be built with CONFIG_KALLSYMS_ALL.
  $ echo $?
  0

So set allow_early to be True when testing f2fsslower.py
in test_tools_smoke.py.

Signed-off-by: Yonghong Song <[email protected]>

tests/python/test_tools_smoke.py

@@ -181,7 +181,7 @@ def test_ext4slower(self):
 
  @skipUnless(kernel_version_ge(4,4), "requires kernel >= 4.4")
  def test_f2fsslower(self):
- self.run_with_int("f2fsslower.py")
+ self.run_with_int("f2fsslower.py", allow_early=True)
 
  @skipUnless(kernel_version_ge(4,4), "requires kernel >= 4.4")
  def test_filelife(self):