project.py: use asyncio to paralelize west update

The projects from manifests were updated one by one.
The parallel aproach has potential to fully utilize
CPU and network connection to speed up the update.

Signed-off-by: Robert Gałat <robert.galat@nordicsemi.no>

src/west/app/project.py

@@ -6,6 +6,7 @@
 '''West project commands'''
 
 import argparse
+import asyncio
 from functools import partial
 import logging
 import os
@@ -1018,18 +1019,23 @@ def update_all(self):
             import_flags=ImportFlag.FORCE_PROJECTS)
 
         failed = []
-        for project in self.manifest.projects:
+
+        def project_update(project):
             if (isinstance(project, ManifestProject) or
                     project.name in self.updated):
-                continue
+                return
             try:
                 if not self.project_is_active(project):
                     self.dbg(f'{project.name}: skipping inactive project')
-                    continue
+                    return
                 self.update(project)
                 self.updated.add(project.name)
             except subprocess.CalledProcessError:
                 failed.append(project)
+
+        loop = asyncio.get_event_loop()
+        looper = asyncio.gather(*[project_update(project) for project in self.manifest.projects])
+        loop.run_until_complete(looper) 
         self._handle_failed(self.args, failed)
 
     def update_importer(self, project, path):
@@ -1090,13 +1096,17 @@ def update_some(self):
             projects = self._projects(self.args.projects)
 
         failed = []
-        for project in projects:
+        def project_update_some(project):
             if isinstance(project, ManifestProject):
-                continue
+                return
             try:
                 self.update(project)
             except subprocess.CalledProcessError:
                 failed.append(project)
+
+        loop = asyncio.get_event_loop()
+        looper = asyncio.gather(*[project_update_some(project) for project in projects])
+        loop.run_until_complete(looper) 
         self._handle_failed(self.args, failed)
 
     def toplevel_projects(self):