buildman: Improve the toolchain progress/error output

Use colour to make it easier to see what is going on. Also print a message
before downloading a new toolchain. Mention --fetch-arch in the message that
is shown when there are no available toolchains, since this is the quickest
way to resolve the problem.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/tools/buildman/control.py b/tools/buildman/control.py
index aeb128a..46053d8 100644
--- a/tools/buildman/control.py
+++ b/tools/buildman/control.py
@@ -107,6 +107,7 @@
         return 0
 
     gitutil.Setup()
+    col = terminal.Color()
 
     options.git_dir = os.path.join(options.git, '.git')
 
@@ -122,14 +123,17 @@
     if options.fetch_arch:
         if options.fetch_arch == 'list':
             sorted_list = toolchains.ListArchs()
-            print 'Available architectures: %s\n' % ' '.join(sorted_list)
+            print col.Color(col.BLUE, 'Available architectures: %s\n' %
+                            ' '.join(sorted_list))
             return 0
         else:
             fetch_arch = options.fetch_arch
             if fetch_arch == 'all':
                 fetch_arch = ','.join(toolchains.ListArchs())
-                print 'Downloading toolchains: %s\n' % fetch_arch
+                print col.Color(col.CYAN, '\nDownloading toolchains: %s' %
+                                fetch_arch)
             for arch in fetch_arch.split(','):
+                print
                 ret = toolchains.FetchAndInstall(arch)
                 if ret:
                     return ret
@@ -138,7 +142,6 @@
     # Work out how many commits to build. We want to build everything on the
     # branch. We also build the upstream commit as a control so we can see
     # problems introduced by the first commit on the branch.
-    col = terminal.Color()
     count = options.count
     has_range = options.branch and '..' in options.branch
     if count == -1: