cli: show useful hint in header area of shell in daemonized mode

Problem:
-------
When auto_use_daemon=true, entering multi-line command-mode/shell-mode appears
like the cli is stuck for new users, as we do not display any info now :-)

$ targetcli
---- nothing here, is it stuck ? -------

$ targetcli
cd /backstores/
get global auto_use_daemon
pwd
ls
exit
auto_use_daemon=true
/backstores
o- backstores ................................................ [...]
  o- block .................................... [Storage Objects: 0]
  o- fileio ................................... [Storage Objects: 0]
  o- pscsi .................................... [Storage Objects: 0]
  o- ramdisk .................................. [Storage Objects: 0]
  o- user:glfs ................................ [Storage Objects: 0]

Solution:
-------

Add some userful info and a '/> ' in each line,

$ targetcli
targetcli shell version 2.1.50
Entering targetcli batch mode for daemonized approach.
Enter multiple commands separated by newline and type 'exit' to run them all in one go.

/> cd /backstores/
/> get global auto_use_daemon
/> pwd
/> ls
/> exit
auto_use_daemon=true
/backstores
o- backstores ................................................ [...]
  o- block .................................... [Storage Objects: 0]
  o- fileio ................................... [Storage Objects: 0]
  o- pscsi .................................... [Storage Objects: 0]
  o- ramdisk .................................. [Storage Objects: 0]
  o- user:glfs ................................ [Storage Objects: 0]

Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/scripts/targetcli b/scripts/targetcli
index 9009a14..49355e3 100755
--- a/scripts/targetcli
+++ b/scripts/targetcli
@@ -163,7 +163,7 @@ def call_daemon(shell, req):
     sock.close()
     sys.exit(0)
 
-def get_arguments():
+def get_arguments(shell):
     readline.set_completer(completer)
     readline.set_completer_delims('')
 
@@ -180,7 +180,13 @@ def get_arguments():
         command = " ".join(sys.argv[argstart:])
     else:
         inputs = []
+        shell.con.display("targetcli shell version %s\n"
+                        "Entering targetcli batch mode for daemonized approach.\n"
+                        "Enter multiple commands separated by newline and "
+                        "type 'exit' to run them all in one go.\n"
+                        % targetcli_version)
         while True:
+            shell.con.raw_write("/> ")
             command = six.moves.input()
             if command.lower() == "exit":
                 break
@@ -227,7 +233,7 @@ def main():
             disable_daemon=True
 
     if use_daemon and not disable_daemon:
-        call_daemon(shell, get_arguments().encode())
+        call_daemon(shell, get_arguments(shell).encode())
         # does not return
 
     try: