Revert "ConfigUtil: add method to populate an existing CacheBuilder"

CacheBuilder has some frustrating state checking to make sure values
are set only once. This means setting values in the config that are
already set in the passed-in CacheBuilder fails with an
IllegalStateException.

Callers unfortunately have to go back to reading only from the config.

This reverts commit 886ed4726d5bbb00d0c8c515c13a0d346e63acee.

Change-Id: I713f46bffb7dc9b646e9a9acfa8223283f51f5ad
3 files changed