[1.9.x] + integrate Grizzly 2.3.21, that has to resolve connection-pool contention problem

Author: oleksiys

pom.xml

@@ -533,7 +533,7 @@
         <distMgmtSnapshotsUrl>http://oss.sonatype.org/content/repositories/snapshots</distMgmtSnapshotsUrl>
         <surefire.redirectTestOutputToFile>true</surefire.redirectTestOutputToFile>
         <netty.version>3.10.3.Final</netty.version>
-        <grizzly.version>2.3.20</grizzly.version>
+        <grizzly.version>2.3.21</grizzly.version>
         <maven.compiler.source>1.7</maven.compiler.source>
         <maven.compiler.target>1.7</maven.compiler.target>
         <surefire.version>2.12</surefire.version>