liblockfile:  Disable linear backoff for lockfile_create.

Linear backoff is unfair, and is causing problems with /bin/wifi.
Change lockfile creation retries to one per second.

Also update existing lockfile-create users to equivalent --retry-count
values as necessary:

* /bin/start and /bin/run-dhclient previously did not specify a retry-
  /count, and were using the default of 9 (180 seconds).  They now use
  /--retry-count 180 to keep the 180-second timeout.

* /bin/ginstall uses --retry-count 0.  No change is necessary.

Change-Id: Id7cfeafd9dfd8e66644ebad1332f918275ba8414
2 files changed