Use svn_hash_gets and svn_hash_sets.

* subversion/libsvn_repos/authz.c
* subversion/libsvn_repos/commit.c
* subversion/libsvn_repos/delta.c
* subversion/libsvn_repos/deprecated.c
* subversion/libsvn_repos/dump.c
* subversion/libsvn_repos/fs-wrap.c
* subversion/libsvn_repos/hooks.c
* subversion/libsvn_repos/load-fs-vtable.c
* subversion/libsvn_repos/load.c
* subversion/libsvn_repos/log.c
* subversion/libsvn_repos/replay.c
* subversion/libsvn_repos/reporter.c
* subversion/libsvn_repos/repos.c
* subversion/libsvn_repos/rev_hunt.c


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1460171 13f79535-47bb-0310-9956-ffa450edef68