Fix issue with log destroyed error message on mount and extra logs on unmount

[jfantinhardesty]

What type of Pull Request is this? (check all applicable)

• Refactor
• Feature
• Bug Fix
• Optimization
• Documentation Update

Describe your changes in brief

This fixes extra errors that were printed on mount success where the logger could be destroyed multiple times and print out a message like:

panic: close of closed channel

goroutine 1 [running]:
github.com/Seagate/cloudfuse/common/log.(*BaseLogger).Destroy(0x2c4404738200)
        github.com/Seagate/cloudfuse/common/log/base_logger.go:208 +0x1f
github.com/Seagate/cloudfuse/common/log.Destroy()
        github.com/Seagate/cloudfuse/common/log/logger.go:143 +0x74
main.main()
        github.com/Seagate/cloudfuse/main.go:49 +0x59

Now the logger can only be destroyed once. Also removed extra logging in unmount that was printing to stdout.

Checklist

• Tested locally
• Added new dependencies
• Updated documentation
• Added tests

Related Issues

• Related Issue #
• Closes #