Make SAX Parser pool size configurable using a system property com.sun.xml.messaging.saaj.soap.saxParserPoolSize
Wrap system property check in AccessController.doPrivileged
Continued from previous 2 commits - SAX Parser pool size. Reduced the amount of code in AccessController.doPrivileged
Merge branch 'desagar_fix_SAAJ-73' into 'master'

Make ParserPool size for SAX Parser configurable using system property

This change pertains to the JIRA issue: https://java.net/jira/browse/SAAJ-73

There was a request to make the size of pool used for SAX Parsers in SAAJ configurable instead of hard-coded to 5, since this size is not suitable for all situations. I have added a system property 'com.sun.xml.messaging.saaj.soap.saxParserPoolSize'.

Note - the pool is maintained as a static member in EnvelopeFactory and so it is not possible to use a SOAP message property or other instance level setting.