Use svn_hash_gets and svn_hash_sets.

* subversion/libsvn_client/add.c
* subversion/libsvn_client/cat.c
* subversion/libsvn_client/commit.c
* subversion/libsvn_client/commit_util.c
* subversion/libsvn_client/copy.c
* subversion/libsvn_client/copy_foreign.c
* subversion/libsvn_client/ctx.c
* subversion/libsvn_client/delete.c
* subversion/libsvn_client/deprecated.c
* subversion/libsvn_client/diff.c
* subversion/libsvn_client/diff_local.c
* subversion/libsvn_client/diff_summarize.c
* subversion/libsvn_client/export.c
* subversion/libsvn_client/externals.c
* subversion/libsvn_client/import.c
* subversion/libsvn_client/info.c
* subversion/libsvn_client/iprops.c
* subversion/libsvn_client/list.c
* subversion/libsvn_client/locking_commands.c
* subversion/libsvn_client/log.c
* subversion/libsvn_client/merge.c
* subversion/libsvn_client/mergeinfo.c
* subversion/libsvn_client/patch.c
* subversion/libsvn_client/prop_commands.c
* subversion/libsvn_client/ra.c
* subversion/libsvn_client/repos_diff.c
* subversion/libsvn_client/revert.c
* subversion/libsvn_client/status.c
* subversion/libsvn_client/switch.c
* subversion/libsvn_client/update.c
* subversion/libsvn_client/util.c


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1460168 13f79535-47bb-0310-9956-ffa450edef68