Change svn-sparc-solaris bot to out-of-tree build with a tmpfs, and
switch to svnserveautocheck.

* tools/buildbot/slaves/svn-sparc-solaris/svncleanup.sh: Unmount tmpfs.

* tools/buildbot/slaves/svn-sparc-solaris/svnbuild.sh: Mount tmpfs, change
   to out-of-tree.

* tools/buildbot/slaves/svn-sparc-solaris/svncheck.sh: Switch to
   svnserveautocheck.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1582246 13f79535-47bb-0310-9956-ffa450edef68