bitbake.conf: FETCHCMD_svn add --non-interactive --trust-server-cert

bitbake.conf: FETCHCMD_svn add --non-interactive --trust-server-cert

* now with subversion-native we know those 2 options are supported
* with https protocol used for SVN checkouts we cannot confirm certificate and do_fetch fails
  Error validating server certificate for 'https://foo:443':
  - The certificate is not issued by a trusted authority. Use the
    fingerprint to validate the certificate manually!
    Certificate information:
    ...
    (R)eject, accept (t)emporarily or accept (p)ermanently? svn: E175002: Unable to connect to a repository at URL 'https://foo/trunk'
    svn: E175002: OPTIONS of 'https://foo/trunk': Server certificate verification failed: issuer is not trusted (https://foo)
    ERROR: Function failed: Fetcher failure for URL: 'svn://foo;protocol=https;module=trunk'. Unable to fetch URL from any source.

(From OE-Core rev: 8f1cedaaafd1248e77db84ac238fa88a318df2e9)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>