Fix FOTA migration completion issue
Fix FOTA migration completion issue

Force a session with the server to complete the FOTA migration path instead
of relying on the polling timer.

Resolves: LE-6992
Change-Id: I4cbdfd22bbd8206f6b01b798e976f51d7a930c8a

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af