SHL-177: Remove unused code

Author: Eric Bottard

src/main/java/org/springframework/shell/core/CliOptionContext.java

@@ -251,8 +251,6 @@ else if (!specifiedKey) {
 
 				// Now we're ready to perform a conversion
 				try {
-					CliOptionContext.setOptionContext(cliOption.optionContext());
-					CliSimpleParserContext.setSimpleParserContext(this);
 					Object result;
 					Converter<?> c = null;
 					for (Converter<?> candidate : converters) {
@@ -287,10 +285,6 @@ else if (!specifiedKey) {
 					}
 					return null;
 				}
-				finally {
-					CliOptionContext.resetOptionContext();
-					CliSimpleParserContext.resetSimpleParserContext();
-				}
 			}
 
 			// Check for options specified by the user but are unavailable for the command