[SERVER-41029] mongocryptd should not delete existing domain socket if it fails to start TCP socket - MongoDB

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Operating System:
ALL
Steps To Reproduce:
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start mongocryptd

verify you can connect with mongo mongodb://%2Ftmp%2Fmongocryptd.sock/

cd to another directory (so pid file differs)

start mongocryptd again, which will fail with "SocketException: Address already in use"

although other mongocryptd is still running, mongo mongodb://%2Ftmp%2Fmongocryptd.sock/ fails with Connection refused
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start mongocryptd verify you can connect with mongo mongodb://%2Ftmp%2Fmongocryptd.sock/ cd to another directory (so pid file differs) start mongocryptd again, which will fail with "SocketException: Address already in use" although other mongocryptd is still running, mongo mongodb://%2Ftmp%2Fmongocryptd.sock/ fails with Connection refused
Sprint:
Security 2019-05-20, Service Arch 2019-06-17, Service Arch 2019-07-01

is related to

SERVER-45895 mongocryptd creates socket and pid files in different locations

SERVER-41826 avoid unlinking the unix domain socket if another process is listening