BUG/MINOR: http-ana: Matching on monitor-uri should be case-sensitive

BUG/MINOR: http-ana: Matching on monitor-uri should be case-sensitive

The monitor-uri should be case-sensitive. In reality, the scheme and the host
part are case-insensitives and only the path is case-sensive. But concretely,
since the start, the matching on the monitor-uri is case-sensitive. And it is
probably the expected behavior of almost all users.

This patch must be backported as far as 1.9. For HAProxy 2.0 and 1.9, it must be
applied on src/proto_htx.c.