Add test for proxy with rev operators

Author: vlad-ivanov-name

tests/proxy/clone_rev_operators.t

@@ -0,0 +1,45 @@
+  $ export GIT_TREE_FMT='%(objectmode) %(objecttype) %(objectname) %(path)'
+  $ . ${TESTDIR}/setup_test_env.sh
+  $ cd ${TESTTMP}
+
+  $ git clone -q http://localhost:8001/real_repo.git
+  warning: You appear to have cloned an empty repository.
+
+  $ cd real_repo
+
+  $ echo contents1 > file
+  $ git add file
+  $ git commit -q -m "commit1"
+
+  $ echo contents2 > file
+  $ git add file
+  $ git commit -q -m "commit2"
+
+  $ echo contents3 > file
+  $ git add file
+  $ git commit -q -m "commit3"
+
+  $ echo contents4 > file
+  $ git add file
+  $ git commit -q -m "commit4"
+
+  $ git log --oneline --no-abbrev-commit
+  c76092ddde20e1071d88491ae990b60b95b50d8a commit4
+  53b7ffe9ba2366c6d317a97bd154f7507ce5e151 commit3
+  27ee1d4576a83a7c50484b680ba68edbbc196662 commit2
+  c4c0a059d8a45f4248f68115445a99e2a241aff8 commit1
+
+  $ git push -q
+  $ git clone -q 'http://localhost:8002/real_repo.git:rev(%3C27ee1d4576a83a7c50484b680ba68edbbc196662:prefix=subdir).git' clone-test
+
+  $ git -C clone-test log --oneline
+  111c99d commit4
+  defc311 commit3
+  5687af0 commit2
+  3200ecb commit1
+
+  $ git -C clone-test ls-tree --format "${GIT_TREE_FMT}" 3200ecb
+  040000 tree 51ca6cbff0e8a61e440831239e1a7750517a608a subdir
+
+  $ git -C clone-test ls-tree --format "${GIT_TREE_FMT}" 111c99d
+  100644 blob 288746e9035732a1fe600ee331de94e70f9639cb file