2019CES demo#3 Switch a display destination of the app

Close for HH RC3

All linked tickets are closed.

https://lf-automotivelinux.atlassian.net/browse/SPEC-2059#icft=SPEC-2059 - Waltham-transmitter: Check error handling when it failed to get dmafd
=> Checking if the fix for https://lf-automotivelinux.atlassian.net/browse/SPEC-2060#icft=SPEC-2060 also works on this.
https://lf-automotivelinux.atlassian.net/browse/SPEC-2060#icft=SPEC-2060 - Waltham-receiver(renamed from waltham-server): Check the behavior of handling rendering request
=> Change made in waltham-receriver which is not yet upstreamed to AGL gerrit. ADIT will upstream it including the fix by end of this month. 

Based on the findings from joint debuggin session, we've applied the workaround to make CES demo workable in time. 
For the remaining future works, I discussed with @Shuhei Aketa san and raised the separated tickets.

https://lf-automotivelinux.atlassian.net/browse/SPEC-2057#icft=SPEC-2057 - Waltham-transmitter: Fix if statement for error handling
https://lf-automotivelinux.atlassian.net/browse/SPEC-2058#icft=SPEC-2058 - Waltham-transmitter: Code refactoring
https://lf-automotivelinux.atlassian.net/browse/SPEC-2059#icft=SPEC-2059 - Waltham-transmitter: Check error handling when it failed to get dmafd
https://lf-automotivelinux.atlassian.net/browse/SPEC-2060#icft=SPEC-2060 - Waltham-server: Check the behavior of handling rendering request