Fix/advanced ldap filters

[mkayontour]

Changed template filter had double quoting active.

Example:

"{{ value | quote }}" 

Gives output like this:

"'test'"

In addition I'll make sure any string starting with "!" will be quoted. Otherwise only filters with "=" get quoted. Don't know if this is a thing.

Fixes #208

[pc2306]

Unfortunately this still didn't work for me. I had problems with LDAP complaining about wrong credentials or filters. It seems that Icinga doesn't like single quotes at some places and passwords with special characters that are not double quoted.

I have changed lines 10 and 11 in ini_template.j2 as follows:

{% elif value is string %}
{{ option }} = "{{ value }}"

and now everything works fine.

Best Regards and thanks for the great work
Peter