Improve messaging to avoid startup error

• Type: Bug
• Status: Open
• Resolution: Unresolved
• Affects Version/s: 7.1.10 DXP GA1
• Fix Version/s: None
• Component/s: App Management > Store
• Labels:
  • ee-ts

Background
It is possible to upgrade the Marketplace plugin from Control Panel. After the upgrade a reboot is necessary.

Issue
However, removing osgi/state folder is also required as plugin version changes. This might not be intuitive enough and proper message should be added.

Steps to reproduce

1. Unzip liferay-dxp-7.1.10-ga1 and install DE-6
   (don't use SP1 or any bundle with Marketplace plugin updated)
2. Start Liferay
3. Login as [e-mail]
4. Navigate to Control Panel > Apps > Store
5. Click on "Sign In"
6. Since navigate to Marketplace page, click "Grant access"
7. Click on "Update"
8. Note that a message informing the need to reboot is displayed
9. Click "OK"
10. Wait until update is completed
11. Stop Liferay
12. Start Liferay again
13. Navigate to Control Panel > Apps > Store

Actual result
No warning about removing osgi/state folder is displayed, so several errors are thrown during startup.

2019-01-23 01:27:04.976 ERROR [Start Level: Equinox Container: f5abad5d-3ffe-4d07-b889-6ae20d33c868][com_liferay_marketplace_service:97] bundle com.liferay.marketplace.service:4.0.9 (969)[com.liferay.marketplace.internal.bundle.BundleManagerUtil(3972)] : The setBundleManager method has thrown an exception 

2019-01-23 01:27:28.692 ERROR [main][com_liferay_marketplace_store_web:97] bundle com.liferay.marketplace.store.web:4.0.0 (708)[com.liferay.marketplace.store.web.internal.portlet.MarketplacePurchasedPortlet(2639)] : The setOAuthManager method has thrown an exception 
java.lang.IllegalArgumentException: argument type mismatch

Store page is displayed with blank.

Expected result
Besides informing the need to reboot, you're informed on the need to clear osgi/state folder

Reproduced in
liferay-dxp-7.1.10-ga1 + install DE-6