Remove removed o.e.jsch.tests plugin from sdk.tests feature

Part of:
- eclipse-platform/eclipse.platform#1865

Author: HannesWell

eclipse.platform.releng/features/org.eclipse.sdk.tests/feature.xml

@@ -179,10 +179,6 @@
          id="org.eclipse.jface.text.tests"
          version="0.0.0"/>
 
-   <plugin
-         id="org.eclipse.jsch.tests"
-         version="0.0.0"/>
-
    <plugin
          id="org.eclipse.core.filebuffers.tests"
          version="0.0.0"/>