Comment 6 for bug 1291249

5.6.16 seems correct with regards to what it "provides":

openxs@ao756:~$ rpm -qp --provides Percona-Server-shared-56-5.6.16-rel64.0.el6.x86_64.rpm
libperconaserverclient.so.18()(64bit)
libperconaserverclient.so.18(libperconaserverclient_18)(64bit)
Percona-Server-shared-56 = 5.6.16-rel64.0.el6
Percona-Server-shared-56(x86-64) = 5.6.16-rel64.0.el6
openxs@ao756:~$ rpm -qpl Percona-Server-shared-56-5.6.16-rel64.0.el6.x86_64.rpm /usr/lib64/libperconaserverclient.so.18
/usr/lib64/libperconaserverclient.so.18.1.0
/usr/lib64/libperconaserverclient_r.so.18
/usr/lib64/libperconaserverclient_r.so.18.1.0