core: Removed JDK7 ConfigurationException ctor

Removed ConfigurationException(String, Throwable, boolean, boolean).
This constructor was introduced to RuntimeException in JDK7, and having
it in the common project breaks JDK6 compatibility[1] required for GWT
compilation.

[1] http://jenkins.ovirt.org/job/ovirt_engine_animal_sniffer_check/5926/console

Change-Id: I057c641a8f05b789bb69e15d524588ba3f0f42fd
Signed-off-by: Allon Mureinik <amureini@redhat.com>