[maint] [maint] Michael Chastain for testsuite

[Andrew Cagney]

Hello,

Michael Chastain has been nominated for the role of testsuite 
maintainer, taking over responsibility for all the open areas of the 
testsuite (config, lib, gdb.base etc.).  In addition, it has been 
proposed that the `global maintainers' serve as backup to Michael in 
these areas (Michael has already indicated that he is ok with this).

Thoughts?  I'll table this for a week.

Andrew