change the log level of cipd ensure command to info

I suspect the reason of INFRA_FAILURE in https://crbug.com/1477933#c10
is that cipd is busy with downloading on the packages (it's also
possible that cipd is stucked on one or more packages) and since the
log-level is error, it won't ouptut anything until it completes.
However, from bot_update PoV, gclient is considered as a stale process
because it won't write anything to stdout in 20min so it decide to kill
the process. This CL fix the issue by changing the log-level to info
instead.

R=sokcevic

Bug: 1477933
Change-Id: I2fa05bcfe7f63debeda3371e755b5e7c6d011f12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4844365
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
Commit-Queue: Yiwei Zhang <yiwzhang@google.com>

gclient_scm.py

@@ -1774,7 +1774,7 @@ class CipdRoot(object):
                     'cipd',
                     'ensure',
                     '-log-level',
-                    'error',
+                    'info',
                     '-root',
                     self.root_dir,
                     '-ensure-file',
@@ -1817,7 +1817,7 @@ class CipdRoot(object):
                         'cipd',
                         'ensure-file-resolve',
                         '-log-level',
-                        'error',
+                        'info',
                         '-ensure-file',
                         ensure_file,
                         '-json-output',