tests: Fix call-forwarding test after CFU logic update

When VoiceUnconditional is activated, all other CF is cleared and
enabled again when VoiceUnconditional is deactivated.

http://comments.gmane.org/gmane.comp.handhelds.ofono/7148 (Ofono CF
states not always correct)
0dc3515af468e23bfc0e934ed94c7ca23c06fde9 (call-forwarding: Update
conditional reporting logic)
69453afe9eeb2eba2024cd1792d25b5da61a439f (call-forwarding: Emit signals
when cfu is toggled]
tests: Fix after eliminating blocking D-Bus calls in QOfonoModem

Broken since 0d112db ([libqofono] Eliminate blocking D-Bus calls in
QOfonoModem)
[tests] Fixed tst_qofonomanager
[libqofono] Fix crash in QOfonoCallForwarding::isValid()

We shouldn't crash if d_ptr->callForward is NULL
(e.g. modem path was never set)
Merge pull request #60 from martyone/fix-tests

Fix tests
Merge pull request #62 from monich/tst_qofonomanager

Fix tst_qofonomanager test
[tests] Fixed tst_qofonoconnman
Merge pull request #63 from monich/tst_qofonoconnman

Fix tst_qofonoconnman test
Bump version to 0.63
Merge pull request #61 from monich/qofonocallforwarding

Fix crash in QOfonoCallForwarding::isValid()
[libqofono] Added QOfonoObject

QOfonoObject incapsulates asynchronous properties query and property change
signal handling. This is a common pattern for many ofono objects.