[git-llvm] Use --force-interactive when commiting to enable SVN to prompt password

When svn does not know the password and it has to prompt, it needs to query.
However it won't when invoked from the Python script and instead fails with:

svn: E215004: Authentication failed and interactive prompting is disabled; see the --force-interactive option

Differential Revision: https://reviews.llvm.org/D27274

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288266 91177308-0d34-0410-b5e6-96231b3b80d8

utils/git-svn/git-llvm

@@ -208,7 +208,7 @@ def svn_push_one_rev(svn_repo, rev, dry_run):
     # Now we're ready to commit.
     commit_msg = git('show', '--pretty=%B', '--quiet', rev)
     if not dry_run:
-        log(svn(svn_repo, 'commit', '-m', commit_msg))
+        log(svn(svn_repo, 'commit', '-m', commit_msg, '--force-interactive'))
         log('Committed %s to svn.' % rev)
     else:
         log("Would have committed %s to svn, if this weren't a dry run." % rev)