Clean up MAINTAINERS.md & clarify guidelines

Robert has not been active on the fabric project. Simon left IBM
and has not indicated any intention of remaining involved in the
project. Hence, both are being removed as maintainers. Of course,
should either decide to become re-engaged in the project, they
will likely be welcomed back.

I have also clarified the guidelines for adding and removing
a maintainer to require only 5 +1s from existing maintainers
if there are more than eight total maintainers.
[ci skip]

Change-Id: I3e8151ac47627c52704472e58c23016212831e14
Signed-off-by: Christopher Ferris <chrisfer@us.ibm.com>

docs/CONTRIBUTING.md

@@ -82,19 +82,20 @@ smoother review.
 
 ### Becoming a maintainer
 
-This project is managed under open governance model as described in our
+This project is managed under an open governance model as described in our
 [charter](https://www.hyperledger.org/about/charter). Projects or sub-projects
-will be lead by a set of maintainers. New projects can designate an initial set
-of maintainers that will be approved by the Technical Steering Committee when
-the project is first approved. The project's maintainers will, from
-time-to-time, consider adding or removing a maintainer. An existing maintainer
-will post a patchset to the [MAINTAINERS.md](MAINTAINERS.md) file. If a
-majority of the maintainers concur in the comments, the pull request is then
-merged and the individual becomes a (or is removed as a) maintainer. Note that
-removing a maintainer should not be taken lightly, but occasionally, people do
-move on - hence the bar should be some period of inactivity, an explicit
-resignation, some infraction of the code of conduct or consistently
-demonstrating poor judgement.
+will be lead by a set of maintainers. New sub-projects can designate an initial
+set of maintainers that will be approved by the top-level project's existing
+maintainers when the project is first approved. The project's maintainers will,
+from time-to-time, consider adding or removing a maintainer. An existing
+maintainer can submit a change set to the [MAINTAINERS.md](MAINTAINERS.md) file.
+If there are less than eight maintainers, a majority of the existing maintainers
+on that project are required to merge the change set. If there are more than
+eight existing maintainers, then if five or more of the maintainers concur with
+the proposal, the change set is then merged and the individual is added to
+(or alternatively, removed from) the maintainers group. explicit resignation,
+some infraction of the [code of conduct](https://wiki.hyperledger.org/community/hyperledger-project-code-of-conduct)
+or consistently demonstrating poor judgement.
 
 ## Legal stuff
 
@@ -104,7 +105,8 @@ License 2.0. A template of that header can be found [here](https://github.com/hy
 We have tried to make it as easy as possible to make contributions. This
 applies to how we handle the legal aspects of contribution. We use the same
 approach—the [Developer's Certificate of Origin 1.1 (DCO)](docs/biz/DCO1.1.txt)—that
-the Linux® Kernel [community](http://elinux.org/Developer_Certificate_Of_Origin) uses to manage code contributions.
+the Linux® Kernel [community](http://elinux.org/Developer_Certificate_Of_Origin)
+uses to manage code contributions.
 
 We simply ask that when submitting a patch for review, the developer must include
 a sign-off statement in the commit message.

docs/MAINTAINERS.md

@@ -5,11 +5,9 @@
 | Binh Nguyen | binhn | | binhn@us.ibm.com |
 | Sheehan Anderson | srderson | sheehan | sranderson@gmail.com
 | Tamas Blummer | tamasblummer ||  tamas@digitalasset.com
-| Robert Fajta | rfajta || robert@digitalasset.com
 | Greg Haskins | ghaskins || ghaskins@lseg.com
 | Jonathan Levi | JonathanLevi || jonathan@levi.name
 | Gabor Hosszu | gabre || gabor@digitalasset.com
-| Simon Schubert | corecode || sis@zurich.ibm.com
 | Chris Ferris | christo4ferris | ChristopherFerris | chrisfer@us.ibm.com
 | Srinivasan Muralidharan | muralisrini | muralisr | muralisr@us.ibm.com
 | Gari Singh | mastersingh24 | mastersingh24 | gari.r.singh@gmail.com