[MIR] bats

[Availability]
In universe

[Rationale]
Since 0.15 update the dh-exec package build-depends on bats - before that it shipped its own bats - in order to run some additional post-build tests.
Due to that bats should be moved to main so dh-exec can use it.

References:
https://launchpad.net/ubuntu/+source/dh-exec/0.16
https://launchpad.net/ubuntu/+source/dh-exec/0.15
http://qa.ubuntuwire.com/ftbfs/#core (dh-exec FTBFS in core)

[Security]
No issues recorded

[Quality assurance]
Well maintained in Debian, no open bugs in binary package
https://bugs.debian.org/cgi-bin/pkgreport.cgi?pkg=bats

One pending bug in source package, fix available and applied to Ubuntu
https://bugs.debian.org/cgi-bin/pkgreport.cgi?src=bats

Well maintained in Ubuntu, no open bugs
https://launchpad.net/ubuntu/+source/bats/+bugs

[Dependencies]
debhelper, in main

[Standards compliance]
Meets Debian Policy requirements

[Maintenance]
Simple test framework, very few updates upstream, doesn't need much maintenance
Ubuntu Foundations {1} has been subscribed to bats.

{1} https://launchpad.net/~foundations-bugs