patman: Make "Reviewed-by" an important tag

Although "Reviewed-by:" is a tag that gerrit adds, it's also a tag
used by upstream.  Stripping it is undesirable.  In fact, we should
treat it as important.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Otavio Salvador <otavio@ossystems.com.br>
Acked-by: Simon Glass <sjg@chromium.org>

tools/patman/README

@@ -198,8 +198,9 @@ END
 	override the default signoff that patman automatically adds.
 
  Tested-by: Their Name <email>
+ Reviewed-by: Their Name <email>
  Acked-by: Their Name <email>
-	These indicate that someone has acked or tested your patch.
+	These indicate that someone has tested/reviewed/acked your patch.
 	When you get this reply on the mailing list, you can add this
 	tag to the relevant commit and the script will include it when
 	you send out the next version. If 'Tested-by:' is set to
@@ -231,7 +232,6 @@ TEST=...
 Change-Id:
 Review URL:
 Reviewed-on:
-Reviewed-by:
 
 
 Exercise for the reader: Try adding some tags to one of your current

tools/patman/patchstream.py

@@ -31,7 +31,7 @@ from series import Series
 
 # Tags that we detect and remove
 re_remove = re.compile('^BUG=|^TEST=|^BRANCH=|^Change-Id:|^Review URL:'
-    '|Reviewed-on:|Reviewed-by:|Commit-Ready:')
+    '|Reviewed-on:|Commit-Ready:')
 
 # Lines which are allowed after a TEST= line
 re_allowed_after_test = re.compile('^Signed-off-by:')
@@ -46,7 +46,7 @@ re_cover = re.compile('^Cover-letter:')
 re_series = re.compile('^Series-(\w*): *(.*)')
 
 # Commit tags that we want to collect and keep
-re_tag = re.compile('^(Tested-by|Acked-by|Cc): (.*)')
+re_tag = re.compile('^(Tested-by|Acked-by|Reviewed-by|Cc): (.*)')
 
 # The start of a new commit in the git log
 re_commit = re.compile('^commit (.*)')