[issue3561] Follow-up commit similar to r900797 for ra_serf layer committing to http-v2 unaware proxy.
[issue3561]
Follow-up commit similar to r900797 for ra_serf layer committing to
http-v2 unaware proxy.

Make CHECKOUT request on VCC url rather than the baseline url as that avoids
the detection of *out of date* baseline url from the mirror and leave that
to CHECKOUT itself via '<D:apply-to-version/>'.

As CHECKOUT is proxied by the mirror we are not getting hit by the original
issue.

* subversion/libsvn_ra_serf/commit.c
(commit_context_t): Replace baseline_url with vcc_url.
(create_checkout_body): Make CHECKOUT body to have '<D:apply-to-version/>'.
(checkout_dir): Make CHECKOUT on vcc_url instead of baseline url.
(open_root): Remove baseline url detection code.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion