Incorrect Include path in /etc/libssh/libssh_{client,server}.config

Hi, In openSUSE Tumbleweed the current default path for openssh configs is;

/usr/etc/ssh/ssh{d}_config

In the packaged libssh (version 0.10.5) the configuration uses;

/etc/libssh/libssh_{client,server}.config containing;

Include /etc/ssh/ssh_config

Which should, after the openSUSE Tumbleweed UsrEtc merge be modified to to contain;

Include /usr/etc/ssh/ssh_config

I have submitted a simple fix in the spec file for the packaged rpm as follows;

%if 0%{?suse_version} > 1600
sed -i '/^Include/ s|/etc|/usr/etc|' %{buildroot}%{_sysconfdir}/libssh/libssh_client.config
sed -i '/^Include/ s|/etc|/usr/etc|' %{buildroot}%{_sysconfdir}/libssh/libssh_server.config
%endif

Please consider this for inclusion in libssh to enhance the move to a read-only root filesystem.

Downstream Ref: https://bugzilla.opensuse.org/show_bug.cgi?id=1211718

UsrEtc Merge Ref: https://en.opensuse.org/openSUSE:Packaging_UsrEtc