Obtain upload lock before uploading

Obtain upload lock before uploading

Before uploading, the system will now set the status as uploading in
order to have more control of the upload process and status.
Without that the UI status updates could show up incorrectly.
Also, this behaviour removes the need to upload a file to set the
upload in progress, which avoids a concurrent upload try to upload
a file if there is another upload in progress.

Change-Id: Ic008560aa57e1ee7a50389ad26f1a8890f1cf198
Issue-ID: SDC-3888
Signed-off-by: andre.schmid <andre.schmid@est.tech>