Revert "Revert "Adds multi_install_skip_symbol_files field (defa..."

Revert submission 1893459-revert-1869814-vapex-multi-config-VKODFOVCWY

Reason for revert: Fix-forward in https://r.android.com/1894088
Reverted Changes:
I087bfe0dc:Revert "Adds a new prop context for choosing betwe...
I27a498506:Revert "Load persist props before starting apexd."...
Ib5344edc0:Revert "Allow users to choose between multi-instal...
If09bf590e:Revert "Adds multi_install_skip_symbol_files field...
I905dac14c:Revert "Demonstrate multi-installed APEXes."

Change-Id: I33210c8d3199338f9c898d719ed1797b629317af