test/integration/jw-pkg -> test/integration/jw_pkg

The mypy module names of the test tree derive from the full path, anchored
by the top-level test/__init__.py, but a file below a path component that
is not a valid identifier - the dashes in jw-pkg - falls back to the bare
file name, so two same-named test.py drivers collide (the duplicate module
error that drove the runme.py and main.py renames).

Rename the directory a sane Python name - jw_pkg, that's the better fix.
Then name the driver test.py like all the others for consistency.

Signed-off-by: Jan Lindemann <jan@janware.com>

test/integration/jw_pkg/projects/create-pkg-config/test-expected.txt

@@ -0,0 +1,31 @@
+============= Running: jw-pkg.py -t ../../../../.. --log-level info projects create-pkg-config -n jw-pkg -s jw-pkg test -p /usr -v 1.0 --cflags=-I/usr/include --libflags=-L/usr/lib -ljw-pkg -r jw-core >= 1.0, jw-base -R jw-devel
+prefix = /usr
+exec_prefix = ${prefix}
+includedir = ${prefix}/include
+libdir = ${exec_prefix}/lib
+
+Name: jw-pkg
+Description: jw-pkg test
+Version: 1.0
+Cflags: -I/usr/include
+Libs: -L/usr/lib -ljw-pkg
+Requires: jw-core >= 1.0, jw-base
+Requires.private: jw-devel============= Running: jw-pkg.py -t ../../../../.. --log-level info projects create-pkg-config -n jw-pkg -p /usr -v 1.0 -r foo bar>=2.0, baz
+prefix = /usr
+exec_prefix = ${prefix}
+includedir = ${prefix}/include
+libdir = ${exec_prefix}/lib
+
+Name: jw-pkg
+Description: 
+Version: 1.0
+Requires: foo, bar >= 2.0, baz============= Running: jw-pkg.py -t ../../../../.. --log-level info projects create-pkg-config -n jw-pkg -p /usr -v 1.0 -R qux
+prefix = /usr
+exec_prefix = ${prefix}
+includedir = ${prefix}/include
+libdir = ${exec_prefix}/lib
+
+Name: jw-pkg
+Description: 
+Version: 1.0
+Requires.private: qux