Tel - Place an MPTY call on hold then merge incoming call

[Jean-Baptiste Lallement]

= Scope of testing =
    - Dialer app functionality works

= Test Steps =
0. Pre-requisite:
    Screen is unlocked,
    dialer-app is not already running
1. Initiate a multiparty call with contact A and B
 > Verify that call to A and B is correctly initiated
2. Receive an incoming call from contact C
 > Verify that snap decision dialog opens
3. Select contact C in swap decision dialog
 > Verify that MPTY call with A and B is placed on hold
        > Verify that call with B becomes active
4. Merge MPTY call with C
        > Verify that MPTY call with A and B becomes active and C is added to the call