Fish hacking setup fix (#18084)

* Remove old egg-info files before creating new ones

Currently, setup.py generates egg files then they are deleted. This change
fixes this behavior and matches that in env-setup.

* Do not try to move ansible*egg-info to lib/

setup.py creates the ansible.egg-info in lib/ so this step is unnecessary. Matches env-setup behavior.

* Better test for number of arguments in argv

This prevents an erronous error message from being thrown since set -q returns an error code with the number of variables not defined, resulting in a non-zero exit if no arguments are passed.

Indent case statement within switch statement.

hacking/env-setup.fish

@@ -9,7 +9,7 @@ set PREFIX_PATH $ANSIBLE_HOME/bin
 set PREFIX_MANPATH $ANSIBLE_HOME/docs/man
 
 # set quiet flag
-if set -q argv
+if test (count $argv) -ge 1
     switch $argv
         case '-q' '--quiet'
             set QUIET "true"
@@ -49,15 +49,14 @@ 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
+end
 if [ $QUIET ]
     python setup.py -q egg_info
 else
     python setup.py egg_info
 end
-if test -e $PREFIX_PYTHONPATH/ansible*.egg-info
-    rm -r $PREFIX_PYTHONPATH/ansible*.egg-info
-end
-mv ansible*egg-info $PREFIX_PYTHONPATH
 find . -type f -name "*.pyc" -delete
 popd