Upgrade the 1.6 branch to Axiom 1.2.17.

pom.xml

diff --git a/pom.xml b/pom.xml
index 064048f..b2f818f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -610,7 +610,7 @@
 
     <properties>
         <axis2.version>1.6.5-SNAPSHOT</axis2.version>
-        <axiom.version>1.2.15</axiom.version>
+        <axiom.version>1.2.17</axiom.version>
 
         <wss4j.version>1.6.16</wss4j.version>
         <opensaml.version>2.5.1-1</opensaml.version>