Creating a text/json writer wrapping over standard output logging writer

[raj-prince]

Description

GCSFuse doesn't writer time-stamp information while logging via os.Stdout/err writer. Added a wrapper over these writer to write all these information.

Command executed:
gcsfuse --debug_fuse --debug_fs --foreground <bucket_name> <mount_dir>

Before:

Creating a new server...
Set up root directory for bucket princer-working-dirs
Mounting file system "princer-working-dirs"...
Error while mounting gcsfuse: mountWithConn: Mount: stat /usr/local/google/home/princer/Documents/code/gcsfuse/mnt: no such file or directory
mountWithArgs: mountWithConn: Mount: stat /usr/local/google/home/princer/Documents/code/gcsfuse/mnt: no such file or directory

After:

I0411 15:33:59.567735 Opening GCS connection...
I0411 15:33:59.567950 Creating a mount at "/usr/local/google/home/princer/Documents/code/gcsfuse/mnt"
I0411 15:33:59.568341 Creating a new server...
I0411 15:33:59.568355 Set up root directory for bucket princer-working-dirs
I0411 15:34:00.900929 Mounting file system "princer-working-dirs"...
I0411 15:34:00.901060 Error while mounting gcsfuse: mountWithConn: Mount: stat /usr/local/google/home/princer/Documents/code/gcsfuse/mnt: no such file or directory
mountWithArgs: mountWithConn: Mount: stat /usr/local/google/home/princer/Documents/code/gcsfuse/mnt: no such file or directory

Link to the issue in case of a bug fix.

Testing details

1. Manual - Manually tested.
2. Unit tests - Automation.
3. Integration tests - Automation.