Remove @sushicw as member and config maintainer (kubernetes#265)

@sushicw has switched projects and will no longer be working on Istio.

org/istio.yaml

@@ -184,7 +184,6 @@ orgs:
     - sunshine6
     - supereagle
     - suryadu
-    - sushicw
     - swade1987
     - tangiel
     - tanjunchen
@@ -370,7 +369,6 @@ orgs:
         - stewartbutler
         - supereagle
         - suryadu
-        - sushicw
         - swade1987
         - tangiel
         - tanjunchen
@@ -477,7 +475,6 @@ orgs:
         - sbezverk
         - sdake
         - suryadu
-        - sushicw
         - therealmitchconnors
         - tiswanso
         - venilnoronha
@@ -509,7 +506,6 @@ orgs:
             - ayj
             - jasonwzm
             - nmittler
-            - sushicw
             privacy: closed
             repos:
               api: write