Improve fish environment setup (ansible#26151)

* Add test runner to PATH

* Add Python3 support

* Updating env-setup.fish to use more portable '-exec' rather than '-delete'

* Create gen_egg_info function

Move code into a function similar to env-setup.

Silence all output when run with -q

hacking/env-setup.fish

@@ -5,7 +5,7 @@ set HACKING_DIR (dirname (status -f))
 set FULL_PATH (python -c "import os; print(os.path.realpath('$HACKING_DIR'))")
 set ANSIBLE_HOME (dirname $FULL_PATH)
 set PREFIX_PYTHONPATH $ANSIBLE_HOME/lib
-set PREFIX_PATH $ANSIBLE_HOME/bin
+set PREFIX_PATH $ANSIBLE_HOME/bin $ANSIBLE_HOME/test/runner
 set PREFIX_MANPATH $ANSIBLE_HOME/docs/man
 
 # set quiet flag
@@ -45,28 +45,59 @@ if not contains $PREFIX_MANPATH $MANPATH
     end
 end
 
+# Set PYTHON_BIN
+if not set -q PYTHON_BIN
+    if test (which python)
+        set -gx PYTHON_BIN (which python)
+    else if test (which python3)
+        set -gx PYTHON_BIN (which python3)
+    else
+        echo "No valid Python found"
+        exit 1
+    end
+end
+
 set -gx ANSIBLE_LIBRARY $ANSIBLE_HOME/library
 
+#
 # Generate egg_info so that pkg_resources works
-pushd $ANSIBLE_HOME
-if test -e $PREFIX_PYTHONPATH/ansible*.egg-info
-    rm -r $PREFIX_PYTHONPATH/ansible*.egg-info
+#
+
+# Do the work in a fuction
+function gen_egg_info
+
+    if test -e $PREFIX_PYTHONPATH/ansible*.egg-info
+        rm -rf "$PREFIX_PYTHONPATH/ansible*.egg-info"
+    end
+
+    if [ $QUIET ]
+        set options '-q'
+    end
+
+    eval $PYTHON_BIN setup.py $options egg_info
+
 end
+
+
+pushd $ANSIBLE_HOME
+
 if [ $QUIET ]
-    python setup.py -q egg_info
+    gen_egg_info ^ /dev/null
+    find . -type f -name "*.pyc" -exec rm -f '{}' ';' ^ /dev/null
 else
-    python setup.py egg_info
+    gen_egg_info
+    find . -type f -name "*.pyc" -exec rm -f '{}' ';'
 end
-find . -type f -name "*.pyc" -delete
-popd
 
+popd
 
 if not [ $QUIET ]
     echo ""
     echo "Setting up Ansible to run out of checkout..."
     echo ""
     echo "PATH=$PATH"
     echo "PYTHONPATH=$PYTHONPATH"
+    echo "PYTHON_BIN=$PYTHON_BIN"
     echo "ANSIBLE_LIBRARY=$ANSIBLE_LIBRARY"
     echo "MANPATH=$MANPATH"
     echo ""