Clean up MAINTAINERS files

* Remove out of date "vacation mode"
* Fix my email address
* Remove infrastructure maintainers to reflect reality (core maintainers
are currently maintaining their own infrastructure).

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)

MAINTAINERS

@@ -1,4 +1,4 @@
-Solomon Hykes <solomon@dotcloud.com> (@shykes)
+Solomon Hykes <solomon@docker.com> (@shykes)
 Guillaume J. Charmes <guillaume@docker.com> (@creack)
 Victor Vieux <vieux@docker.com> (@vieux)
 Michael Crosby <michael@crosbymichael.com> (@crosbymichael)

engine/MAINTAINERS

@@ -1 +1 @@
-#Solomon Hykes <solomon@dotcloud.com> Temporarily unavailable
+Solomon Hykes <solomon@docker.com>

hack/infrastructure/MAINTAINERS

@@ -1,2 +0,0 @@
-Ken Cochrane <ken@dotcloud.com> (@kencochrane)
-Jerome Petazzoni <jerome@dotcloud.com> (@jpetazzo)