Use java.io.File to concatenate path components

[rslemos]

When concatenating path components, care should be taken to introduce path separators ("/") when needed.

In:

liberty-arquillian/liberty-managed/src/main/java/io/openliberty/arquillian/managed/WLPManagedContainer.java

Line 1430 in f25954c

String serverConfigDir = getWlpUsrDir() + "servers/" + containerConfiguration.getServerName();

it should be noted that getWlpUsrDir() must return a directory with / appended to it.

Otherwise it may error out with:

Caused by: java.io.FileNotFoundException: C:\dev-env\wlp-usrservers\myserver\server.xml (The system could not find the specified path.)

[cherylking]

This was actually fixed in this PR last year: #70

We just have not released version 1.0.7 yet with the fix. I will work on that and post here when it is available.

[cherylking]

Release 1.0.7 is available with the fix for this issue: https://github.com/OpenLiberty/liberty-arquillian/releases/tag/arquillian-parent-liberty-1.0.7