Fix issue with source command completion

Avoid competion for bash builtin `source` and fallback to default implementation as it throws below error
```
-bash: source: --: invalid option
source: usage: source filename [arguments]
```

autocomplete/bash_autocomplete

@@ -3,6 +3,7 @@
 : ${PROG:=$(basename ${BASH_SOURCE})}
 
 _cli_bash_autocomplete() {
+  if [[ "${COMP_WORDS[@]:0:$COMP_CWORD}" != "source" ]]; then
     local cur opts base
     COMPREPLY=()
     cur="${COMP_WORDS[COMP_CWORD]}"
@@ -13,8 +14,8 @@ _cli_bash_autocomplete() {
     fi
     COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
     return 0
+  fi
 }
 
-complete -F _cli_bash_autocomplete $PROG
-
+complete -o bashdefault -o default -o nospace -F _cli_bash_autocomplete $PROG
 unset PROG