cleanup of conversation dependencies

Author: jhoeller

org.springframework.context/template.mf

@@ -34,7 +34,6 @@ Import-Template:
  org.omg.CORBA.*;version="0";resolution:=optional,
  org.springframework.aop.*;version=${spring.osgi.range};resolution:=optional,
  org.springframework.beans.*;version=${spring.osgi.range},
- org.springframework.conversation.*;version=${spring.osgi.range},
  org.springframework.core.*;version=${spring.osgi.range},
  org.springframework.expression.*;version=${spring.osgi.range};resolution:=optional,
  org.springframework.instrument.*;version="0";resolution:=optional,