Allow ConfigurableClassLoader to use caching for specific classes

Without classes caching in ConfigurableClassLoader, we encounter very slow execution for signed jar classes.

This ticket allows specifying class that we want to force caching.

Resolution selected:

When using ConfigurableClassLoader (tccl) define a system property named talend.tccl.cacheable.classes which contains a list of cacheables classes prefixes separated by ,.
Sample

System.setProperty("talend.tccl.cacheable.classes", "org.apache.ziplock.JarLocation,com.ctc.wstx.stax");

When this property is set all classes starting by the prefixes will be cacheables. Ie:

• org/apache/ziplock/JarLocation.class will use cache.
• org/apache/ziplock/Archive.class will NOT use cache.