TS-2976: lib records build cleanup

Use the correct constant for MGMT_SIGNAL_SAC_SERVER_DOWN.

Remove REC_SignalManager compatibility define.

Replace REC_SignalWarning and REC_SignalError macros with
RecSignalWarning.

Remove the LOCAL_MANAGER and PROCESS_MANAGER defines.  With this
change, we no longer compile any code differently depending on the
LOCAL_MANAGER and PROCESS_MANAGER defines.  Where we build libraries
that have local and process variants, we just stub a small set of
symbols to do the right thing.