SWITCHYARD-2976 - update to org.slf4j reference

Author: bfitzpat

eclipse/plugins/org.switchyard.tools.core/META-INF/MANIFEST.MF

@@ -7,8 +7,7 @@ Bundle-Vendor: %Bundle-Vendor
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Bundle-ActivationPolicy: lazy
 Require-Bundle: org.eclipse.core.runtime;bundle-version="3.6.0",
- org.apache.log4j;bundle-version="1.2.15",
- org.slf4j.api;bundle-version="1.6.0"
+ org.apache.log4j;bundle-version="1.2.15"
 Bundle-ClassPath: .,
  lib/switchyard-api.jar,
  lib/switchyard-common.jar,
@@ -217,3 +216,4 @@ Export-Package: org.switchyard,
  org.switchyard.validate,
  org.switchyard.validate.config.model,
  org.switchyard.validate.config.model.v1
+Import-Package: org.slf4j;version="1.7.2"