946107a68f Only log "Using PATH_TO_bitcoin.conf" message on startup if conf file exists. (Alexander Leishman)
Pull request description:
Currently we log a message indicating that a bitcoin.conf file is being used even if one does not exist. This PR changes the logic to:
**If config file does not exist and no -conf flag passed, log:**
`Config file: FILE_PATH (not found, skipping)`. Where `FILE_PATH` is the default or the path passed in with the `-conf` flag.
**If config file does not exist and -conf flag passed with incorrect path, log warning:**
`Warning: The specified config file FILE_PATH does not exist`
**If config file exists, log**:
`Config file: FILE_PATH`
Note: This is a (modified) subset of changes introduced in https://github.com/bitcoin/bitcoin/pull/13761 which creates a default example config file. I think it makes sense to extract this small bit out into a separate PR.
Tree-SHA512: be0f0ae6a0c9041e2d6acb54d2563bbcc79786fb2f8bf9a963fe01bc54cd4e388b89079fde1eb79f7f17099776428e5e984bf7107590a3d1ecfc0562dbc6e3f5
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