Propagate env vars and working dir to all cloned commands, remove
unnecessary shadowing attributes, use ptr instead of value for
anonymous embed to make sure we never get mutation-of-copy
surprises, small test improvements.
UdpInput now removes Unix datagram file on shutdown, and uses a
channel instead of an attribute to signal stop to avoid races.
Merge pull request #1112 from mozilla-services/process_input_env

Propagate env vars and working dir to all cloned commands
Typo
Merge pull request #1113 from mozilla-services/udp_input_cleanup

Udp input cleanup
Explicitly check that `file_match` is specified.
Merge pull request #1118 from mozilla-services/missing_file_match_crash

Explicitly check that `file_match` is specified.
LogStreamer reader: reset priorEOF after successfull read