A new flag `disableDependencyUpdate` is added to the `fleet.yaml`
file in order to disable the feature, which is active by default.

A new package `helmupdater` is added to implement the dependencies
update.
The implementation is based on helm's when ussing the
`--dependency-update` flag in the install command.

Dependencies are applied to the bundle (upstream) to they're resolved
already when applying downstream.

Refers to: rancher#1672

Signed-off-by: Xavi Garcia <[email protected]>

Signed-off-by: Xavi Garcia <[email protected]>

Signed-off-by: Xavi Garcia <[email protected]>

Changed from disableDependencyUpdate to disableDepsUpdate

Signed-off-by: Xavi Garcia <[email protected]>

Eventually is not needed when testing for resources in bundles as we get
the bundle from `cli.GetBundleListFromOutput` and the buffer read will be
in its final state once `cli.GetBundleListFromOutput` returns.

Also addind custom Gomega matchers to avoid using helper functions and
to get the exact line when any test assertion fails.

Already existing tests have been changed to use the custom matchers and
don't use Eventually, also.

Signed-off-by: Xavi Garcia <[email protected]>