Change table headings to th tags to prep for css changes

...sole/java/src/net/i2p/router/web/ConfigClientsHelper.java

...sole/java/src/net/i2p/router/web/ConfigTunnelsHelper.java

router/java/src/net/i2p/router/JobQueue.java

.../net/i2p/router/peermanager/ProfileOrganizerRenderer.java

...r/java/src/net/i2p/router/transport/udp/UDPTransport.java

...ava/src/net/i2p/router/tunnel/pool/TunnelPoolManager.java