fix covarity defects;
Merge remote-tracking branch 'origin/4.5.3' into 4.5.3

Conflicts:
	ui/src/main/java/thredds/ui/monitor/TdsDownloader.java
	ui/src/main/java/ucar/nc2/ui/widget/URLDumpPane.java
	ui/src/main/java/ucar/nc2/util/net/HttpClientManager.java
Merge remote-tracking branch 'origin/4.5.3' into 4.5.3

Conflicts:
	httpservices/src/main/java/ucar/httpservices/HTTPSession.java
fix covarity defects;