[WFLY-3641] Upgrade httpcomponents

httpcomponents-core to 4.2.5
httpcomponents-httpclient to 4.2.6

Relative BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1078186

According from httpcomponent release notes upgrading to 4.2.6 won’t break backward compatibility:

	https://www.apache.org/dist/httpcomponents/httpcore/RELEASE_NOTES-4.3.x.txt
	http://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.2.x.txt