Bug 2019: Have FeatureConfigPusher retry installedFeature check
until it succeeds (or 100ms pass).

Karaf reports FeatureEvents before it marks the features
installed.  It also only guarantees complete info about
the features when you read the installed ones.  This
is causing a race condition that is at the root of 2019.

So this patch retries at 1ms intervals until we see

Change-Id: I67080475fc4b2dc2f053a286424f676f89164b6e
Signed-off-by: Ed Warnicke <eaw@cisco.com>
Merge "Bug 2019: Have FeatureConfigPusher retry installedFeature check until it succeeds (or 100ms pass)."