Fix scanf buffer overflows

Fix potential buffer overflows caused by misuse of the scanf function
in the fileserver and ptserver.

Also fix similar issues in the client side fs command and libadmin
library.

Change-Id: Ia6a46981c50537da1673507c2bc777f96e43f95a
make openafs 1.6.2

update version strings for 1.6.2

Change-Id: I60a765f899f09366b6b380b49dc14c191203af15