Suppress all exceptions during DeleteOnExitPathHook

[lbergelson]

Description

• Currently we were not catching some commonly thrown exceptions like RuntimeIOException while deleting files at shutdown. This results in confusing error messages at program exit which can mask the actual cause of failures. Now we catch all exceptions and output a log message at debug level in case anyone is interested in seeing the failures.

[codecov-io]

Codecov Report

Merging #1409 into master will increase coverage by 0.002%. The diff coverage is 100%.

@@               Coverage Diff               @@
##              master     #1409       +/-   ##
===============================================
+ Coverage     68.101%   68.102%   +0.002%     
  Complexity      8373      8373               
===============================================
  Files            573       573               
  Lines          33963     33965        +2     
  Branches        5668      5668               
===============================================
+ Hits           23129     23131        +2     
+ Misses          8645      8644        -1     
- Partials        2189      2190        +1

Impacted Files	Coverage Δ	Complexity Δ
...htsjdk/samtools/util/nio/DeleteOnExitPathHook.java	80.952% <100%> (-8.521%)	3 <1> (-1)
src/main/java/htsjdk/samtools/util/Log.java	54.321% <0%> (+2.469%)	21% <0%> (+1%)	:arrow_up:

[lbergelson]

I don't know why it wouldn't. It's basically just writing to system.err so unless you're 100% out of memory it doesn't seem like it would be problematic. I googled for restrictions on shutdown hooks and the only thing that's definitely not allowed is registering a new shutdown hook. I'm definitely not an expert on it though, so I might be wrong...