docker-registry: Make version dependence compatible with opkg

Some recipes in RDEPENDS are installing specific version of package, for
example:
  gunicorn (= 19.1.1)

If usigin ipk for PACKAGE_CLASSES, opkg prints error:

Collected errors:
 * satisfy_dependencies_for: Cannot satisfy the following dependencies
 for docker:
 *      gunicorn (= 19.1.1) *
 * opkg_install: Cannot install package docker.

This error is caused because opkg appends package revision to version.
In this case:
  gunicorn_19.1.1-r0.1

If we use comparator >= this error doesn't appear.

Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

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