Fix get_pip_command()

Be more flexible in finding pip, especially after we start replacing it

Change-Id: I14b0ac1584aab99c2fe58a78e3a43196ae8130ca
diff --git a/functions b/functions
index 84e88fb..b82b71f 100644
--- a/functions
+++ b/functions
@@ -1483,11 +1483,7 @@
 # Get the path to the pip command.
 # get_pip_command
 function get_pip_command() {
-    if is_fedora; then
-        which pip-python
-    else
-        which pip
-    fi
+    which pip || which pip-python
 
     if [ $? -ne 0 ]; then
         die $LINENO "Unable to find pip; cannot continue"