[data/etc/bash_completion.d/sonic-clear] Issue: clear tab completion shows garbage value (sonic-net#269)

$ clear ^[[3;J^[[H^[[2J

Changes :
1.) Have bash_completion function for sonic-clear command instead of clear command.
2.) Use the same completion function for clear[/usr/bin/clear] as well.
3.) Change name of _clear_completion to _sonic_clear_completion.
4.) Replace $1 with "sonic-clear" in _sonic_clear_completion, so that it can be reused for clear.

Signed-off-by: Praveen Chaudhary <[email protected]>

Author: Praveen Chaudhary

data/etc/bash_completion.d/sonic-clear

@@ -1,8 +1,9 @@
-_clear_completion() {
+_sonic_clear_completion() {
     COMPREPLY=( $( env COMP_WORDS="${COMP_WORDS[*]}" \
                    COMP_CWORD=$COMP_CWORD \
-                   _CLEAR_COMPLETE=complete $1 ) )
+                   _SONIC_CLEAR_COMPLETE=complete sonic-clear ) )
     return 0
 }
 
-complete -F _clear_completion -o default clear;
+complete -F _sonic_clear_completion -o default sonic-clear;
+complete -F _sonic_clear_completion clear;