Implement progress bars for file uploads

Provide pretty status bars to indicate upload progress for tasks that
perform large file uploads to the API ('provisioner ova upload' and
'storage volume upload') so the administrator can gauge progress and
estimated time to completion.

client-cli/cli_lib/provisioner.py

@@ -25,8 +25,10 @@ import re
 import subprocess
 import ast
 
+from requests_toolbelt.multipart.encoder import MultipartEncoder, MultipartEncoderMonitor
+
 import cli_lib.ansiprint as ansiprint
-from cli_lib.common import call_api
+from cli_lib.common import UploadProgressBar, call_api
 
 #
 # Primary functions
@@ -399,10 +401,22 @@ def ova_upload(config, name, ova_file, params):
     API arguments: pool={pool}, ova_size={ova_size}
     API schema: {"message":"{data}"}
     """
-    files = {
-        'file': open(ova_file,'rb')
+    import click
+
+    bar = UploadProgressBar(ova_file, end_message="Parsing file on remote side...", end_nl=False)
+    upload_data = MultipartEncoder(
+        fields={ 'file': ('filename', open(ova_file, 'rb'), 'text/plain')}
+    )
+    upload_monitor = MultipartEncoderMonitor(upload_data, bar.update)
+
+    headers = {
+        "Content-Type": upload_monitor.content_type
     }
-    response = call_api(config, 'post', '/provisioner/ova/{}'.format(name), params=params, files=files)
+
+    response = call_api(config, 'post', '/provisioner/ova/{}'.format(name), headers=headers, params=params, data=upload_monitor)
+
+    click.echo("done.")
+    click.echo()
 
     if response.status_code == 200:
         retstatus = True