File install log timestamp issue

[datamel]

File installation log and suite log should be using the same timestamp. They are currently created a few seconds apart which results in a discrepancy.

e.g.

This issue follows: #3796

Coming back to this with an edit in light of #4804:

In order to solve this, the timestamp from the log will need to be recorded and used for the remote file installation log, which should only be opened for the remote file installation logging, not at scheduler start up, which is currently the case. This will prevent the file installation log from being created for workflows that have only localhost tasks.

[datamel]

Closing this issue. In #4836, timestamps were removed from the file names, so this is no longer an issue.