streamserver: use internal setting for authentication

the streamserver should not depend on the webinterface,
so introduce our own setting, instead of checking an
external openwebif setting.
Ensure that the ecm info in softcamSetup is the latest
streamserver: fix potential segfault on authentication

crypt_r returns NULL when the salt string is empty
(which happens when the password hash is empty)
Merge branch 'master' of git://git.code.sf.net/p/openpli/enigma2