### Please describe the problem.
`git-annex sync gcryptremote` makes too many ssh connections one after another for each sub-task involved, potentially triggering firewall rate-limits on the SSH server.

### What steps will reproduce the problem?
sync with gcrypt remote while watching sshd logs on the server (I was getting >=5 connections per single sync in quick succession)

### What version of git-annex are you using? On what operating system?
Fedora 19, installed through cabal (without s3 and webapp support as the deps were failing to build)

    $ git annex version
    git-annex version: 5.20150205
    build flags: Assistant Pairing WebDAV Inotify DBus DesktopNotify XMPP DNS Feeds Quvi TDFA TorrentParser
    key/value backends: SHA256E SHA1E SHA512E SHA224E SHA384E SKEIN256E SKEIN512E MD5E SHA256 SHA1 SHA512 SHA224 SHA384 SKEIN256 SKEIN512 MD5 WORM URL
    remote types: git gcrypt bup directory rsync web bittorrent webdav tahoe glacier ddar hook external
    local repository version: 5
    supported repository version: 5
    upgrade supported from repository versions: 0 1 2 4

### Please provide any additional information below.

[[!format sh """
# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log


# End of transcript or log.
"""]]