Make Jhove compilable with JDK 9.0 and latter

[tledoux]

Add explicit import of edu.harvard.hul.ois.jhove.Module
Make XmlHandlerTest work independently of the order of execution
Fixes #508

[codecov]

Codecov Report

Merging #514 into integration will increase coverage by 0.2%.
The diff coverage is n/a.

@@               Coverage Diff                @@
##             integration     #514     +/-   ##
================================================
+ Coverage           49.7%   49.91%   +0.2%     
  Complexity           987      987             
================================================
  Files                 55       55             
  Lines               7748     7800     +52     
  Branches            1406     1409      +3     
================================================
+ Hits                3851     3893     +42     
- Misses              3433     3441      +8     
- Partials             464      466      +2

Impacted Files	Coverage Δ	Complexity Δ
...main/java/edu/harvard/hul/ois/jhove/JhoveBase.java	41.79% <ø> (ø)	41 <0> (ø)	⬇️
.../edu/harvard/hul/ois/jhove/handler/XmlHandler.java	62.91% <ø> (+0.09%)	276 <0> (ø)	⬇️
...edu/harvard/hul/ois/jhove/handler/TextHandler.java	0.55% <ø> (ø)	2 <0> (ø)	⬇️

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[carlwilson]

Am back on these now until the end of the week. This has a nasty conflict I'll need to look at close up to resolve first but will do so soon.