more little Services updates

[marc1uk]

• make wait on startup for services to connect to middleman configurable
• forward Services class to SlowControlCollection so it can log problems
• add a separate buffer of monitoring (device+subject) and reject duplicates in monitoring merge period based on this, rather than the buffer. Needed as the buffer may be flushed early if we exceed the MTU size, which would otherwise bypass rate limiting.
• set "Config" slow control state in LoadConfigSlowControlFunc
• add conversion of line breaks in logging messages to '\n', as these otherwise break DB insertion!
• report state of testing flag in LocalConfig slow control response
• set SlowControlCollection warning bit if a slow control callback fails... tenatively
• set SlowControlCollection error bit if an alert fails to receive, decompress, or callback function fails
• make Services a friend class of SlowControlCollection, and make SetTesting, TestingEnable, TestingDisable functions private