BUG/MINOR: server/cli: add missing LF at the end of certain notice/error lines

BUG/MINOR: server/cli: add missing LF at the end of certain notice/error lines

Some cli_err(), cli_msg() or even ha_error() etc are missing the trailing
LF, which breaks the continuity of the CLI parsing: the extra LF that serves
to mark the end of the command is in fact taken as the missing LF and no
extra one is added.

This patch adds the missing LF on identified messages. It might be worth
trying to proceed in a more generic way with this, given the amount of
code that is possibly at risk.