Added keepalive back in reader settings.

keepalive = 1 , now back possible into reader camd35 and cs378x. On specific request of blueven.
WARNING ! using this parameter by camd35 causes a lot of freezes. By cs378x less but still it causes freezes by zapping. lb(loadbalancer) unusable with those settings.

For cacheex mode > 1 the keepalive = 1 always set and forced.

Users who do not use cacheex just do not use this parameter. It renders the lb unusable and causes the dvbapi to try to decode other then priotorised caid:ident.

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@9793 4b0bc96b-bc66-0410-9d44-ebda105a78c1