add context for warnings emitted from configure_mappers(), autoflush()

add context for warnings emitted from configure_mappers(), autoflush()

Improved the notification of warnings that are emitted within the configure
mappers or flush process, which are often invoked as part of a different
operation, to add additional context to the message that indicates one of
these operations as the source of the warning within operations that may
not be obviously related.

Fixes: #7305
Change-Id: I79da7a6a5d4cf67d57615d0ffc2b8d8454011c84