Added get_abi_version() to stout's ELF abstraction.
Added get_abi_version() to stout's ELF abstraction.

This function returns the ABI version of the ELF file by parsing the
contents of its '.note.ABI-tag' section. This section is Linux
specific and adheres to the format described in the links below.

https://refspecs.linuxfoundation.org/LSB_1.2.0/gLSB/noteabitag.html
http://flint.cs.yale.edu/cs422/doc/ELF_Format.pdf

https://reviews.apache.org/r/49564/

chhsia0/mesos,reneploetz/mesos,andschwa/mesos,Gilbert88/mesos,gsantovena/mesos,zmalik/mesos,verizonlabs/mesos,abudnik/mesos,abudnik/mesos,jpeach/mesos,andschwa/mesos,reneploetz/mesos,asamerh4/mesos,chhsia0/mesos,gsantovena/mesos,Gilbert88/mesos,verizonlabs/mesos,yuquanshan/customizedMesos,dforsyth/mesos,verizonlabs/mesos,Aman-Jain-14/customizedMesos,asamerh4/mesos,Aman-Jain-14/customizedMesos,yuquanshan/customizedMesos,Aman-Jain-14/customizedMesos,chhsia0/mesos,dforsyth/mesos,neilconway/mesos,reneploetz/mesos,kaysoky/mesos,abudnik/mesos,andschwa/mesos,dforsyth/mesos,andschwa/mesos,jpeach/mesos,kaysoky/mesos,kaysoky/mesos,verizonlabs/mesos,jpeach/mesos,reneploetz/mesos,jpeach/mesos,dforsyth/mesos,gsantovena/mesos,andschwa/mesos,Gilbert88/mesos,reneploetz/mesos,craimbert/mesos,chhsia0/mesos,neilconway/mesos,asamerh4/mesos,yuquanshan/customizedMesos,abudnik/mesos,neilconway/mesos,andschwa/mesos,dforsyth/mesos,gsantovena/mesos,gsantovena/mesos,craimbert/mesos,yuquanshan/customizedMesos,Aman-Jain-14/customizedMesos,zmalik/mesos,abudnik/mesos,kaysoky/mesos,yuquanshan/customizedMesos,reneploetz/mesos,zmalik/mesos,asamerh4/mesos,zmalik/mesos,chhsia0/mesos,kaysoky/mesos,craimbert/mesos,Aman-Jain-14/customizedMesos,abudnik/mesos,jpeach/mesos,yuquanshan/customizedMesos,reneploetz/mesos,craimbert/mesos,zmalik/mesos,andschwa/mesos,neilconway/mesos,neilconway/mesos,abudnik/mesos,gsantovena/mesos,dforsyth/mesos,zmalik/mesos,Gilbert88/mesos,chhsia0/mesos,kaysoky/mesos,craimbert/mesos,neilconway/mesos,Aman-Jain-14/customizedMesos,jpeach/mesos,Gilbert88/mesos,dforsyth/mesos,Gilbert88/mesos,chhsia0/mesos,kaysoky/mesos,craimbert/mesos,jpeach/mesos,asamerh4/mesos,gsantovena/mesos,Gilbert88/mesos,neilconway/mesos,asamerh4/mesos,asamerh4/mesos,verizonlabs/mesos,zmalik/mesos,verizonlabs/mesos,Aman-Jain-14/customizedMesos,verizonlabs/mesos,craimbert/mesos,yuquanshan/customizedMesos