Use Java 7 style exception handling in IoUtil

- The try-with-resources statement ensures that the URLClassReader
  is always closed, and allows to remove the suppression of Eclipse's
  warning about an unclosed resource.

- Catching multiple exception types in the same block reduces the
  amount of duplicated code.

Change-Id: Iead344269bc0b985b2cd2176f15a764e6a0abb70
1 file changed