Add macro to handle string or list

Added a macro to handle multivalue options entered in either string
format or list format (with auto joiner).

openssh/files/sshd_config

 {{ option_impl(keyword, default, True) }}
 {%- endmacro -%}
 
+{#- macro for collapsing a list into a string -#}
+{%- macro option_collapselist(keyword, sep) -%}
+{%- do processed_options.append(keyword) -%}
+{{keyword}} {{sshd_config.get(keyword)|join(sep)}}
+{%- endmacro -%}
+
+{#- macro for handling an option that can be specified as a list or a string -#}
+{%- macro option_string_or_list(keyword, default, default_commented, sep=',') -%}
+{%- if sshd_config.get(keyword, '') is string -%}
+  {%- if default_commented -%}
+{{ option(keyword, default) }}
+  {%- else -%}
+{{ option_default_uncommented(keyword, default) }}
+  {%- endif -%}
+{%- else -%}
+{{ option_collapselist(keyword, sep) }}
+{%- endif -%}
+{%- endmacro -%}
+
+{%- if sshd_config.get('ConfigBanner', False) -%}
+{{ sshd_config['ConfigBanner'] }}
+{%- else -%}
 # This file is managed by salt. Manual changes risk being overwritten.
+{%- endif %}
 # The contents of the original sshd_config are kept on the bottom for
 # quick reference.
 # See the sshd_config(5) manpage for details
 {{ option('AllowGroups', '') }}
 
 # Specifies the available KEX (Key Exchange) algorithms.
-{{ option('KexAlgorithms', 'ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1') }}
+{{ option_string_or_list('KexAlgorithms', 'ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1', True) }}
 
 # Specifies the ciphers allowed for protocol version 2.
-{{ option('Ciphers', 'aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se') }}
+{{ option_string_or_list('Ciphers', 'aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se', True) }}
 
 # Specifies the available MAC (message authentication code) algorithms.
-{{ option('MACs', 'hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96') }}
+{{ option_string_or_list('MACs', 'hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96', True) }}
 
 {# Handling unknown in salt template options #}
 {%- for keyword in sshd_config.keys() %}
     {%- endfor %}
   {%- endfor %}
 {%- endif %}
+
+{#- vim: set ft=jinja : #}