Yet another weird UML quirk. The intent of this tests was to ensure
the profile gets encrypted, and to check this both the mtime and
contents of the profile were checked.
But under UML the profile is copied, IWD started, and the profile
is encrypted all without any time passing. The (same) mtime was
then updated without any changes which fails the mtime check.
This puts a sleep after copying the profile to ensure the system
time differs once IWD encrypts the profile.
test_decryption_failure is quite simple and only verifies that a known
network exists after starting. This causes the test to end before IWD can
fully start up leaving the DBus utilities in limbo having not fully
initialized.
Then, on the next test, stale InterfaceAdded signals arrive (for Station
and P2P) which throw exceptions when trying to get the bus (since IWD is
long gone). In addition the next IWD instance has started so any paths
included in the InterfaceAdded signals are bogus and cause additional
exceptions.
At the end of this test we can call list_devices() which will wait for
the InterfaceAdded signal, and cleanly exit afterwards.
