Bump Javassist to 3.26.0-GA

3.25 fixes:
- jboss-javassist/javassist#72
- jboss-javassist/javassist#241
- jboss-javassist/javassist#242
- jboss-javassist/javassist#246
- jboss-javassist/javassist#252
3.26 fixes:
- jboss-javassist/javassist#265
- jboss-javassist/javassist#270
- jboss-javassist/javassist#271
- jboss-javassist/javassist#275

Of these #270 is most important, as it fixes an issue we've seen
with powermock downstream.

Change-Id: Ib4d75d6411e71438436249a8eb9313ccf4411ca2
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>
(cherry picked from commit 6a404f1)

features/odl-javassist-3/src/main/history/dependencies.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <features xmlns="http://karaf.apache.org/xmlns/features/v1.5.0" name="odl-javassist-3">
     <feature version="0.0.0">
-        <bundle>mvn:org.javassist/javassist/3.24.1-GA</bundle>
+        <bundle>mvn:org.javassist/javassist/3.26.0-GA</bundle>
     </feature>
 </features>

odlparent/pom.xml

@@ -682,7 +682,7 @@
       <dependency>
         <groupId>org.javassist</groupId>
         <artifactId>javassist</artifactId>
-        <version>3.24.1-GA</version>
+        <version>3.26.0-GA</version>
       </dependency>
       <dependency>
         <groupId>org.jboss.spec.javax.transaction</groupId>