File names with colon are being disallowed because of the Alternate Data 
Stream (ADS) feature of NTFS that could be misused. ADS allows data to be 
written to alternate streams of a normal file. The data in alternate 
streams cannot be seen by normal tools on Windows (explorer, cmd.exe). As 
a result someone can use this feature to hide large amount of data in 
alternate streams and admins will have no easy way of figuring out the 
files that are using that disk space. The fix also disallows ADS in the 
scenarios where file name is passed as some dynamic variable.

An important thing about the fix is that it DOES NOT disallow ADS file 
names if they are not dynamic (i.e. if the file is created by using some 
option that needs local access to the MySQL server, for example error log
file). The reasoning is that if some MySQL option related to files 
requires access to the local machine (it is not dynamic), then user can very 
well create data in ADS by some other means. This fixes only those scenarios 
which can allow users to create data in ADS over the wire.

File names with colon are being disallowed only on Windows. UNIX 
(Linux in particular) supports NTFS, but it will not be a common 
scenario for someone to configure a NTFS file system to store MySQL 
data on Linux.

Changes in file bug11761752-master.opt are needed due to 
bug number 15937938.