[PATCH] Bug 3349: Bad support for adaptation service URIs with '='

Currently using URIs which include "=" is not supported by
ecap_service/icap_service configuration parameters. Also the squid.conf
documentation about ecap_service is outdated.

This patch
- Fixes the [e|i]cap_service line parser to allow URIs with "="
- Changes the [e|i]cap_service configuration parameter to use the
following syntax:
    ecap_service id vectoring_point uri [name=value ...]
- Check for duplicated options
- Fixes the related documentation
- Also the older [e|i]cap_service syntax forms are supported:
    ecap_service id vectoring_point [1|0] uri
    ecap_service id vectoring_point [name=value ...] uri
- The "uri" options is not documented but supported.

This is a Measurement Factory project.