[oe] drbd-utils: fix dependency for perl under small-fs

[Yadi Hu]

when run drbd-overview under samll fs, the perl script fails to run
due to lack of perl's lib. warning shows as below:

drbd-overview
random: nonblocking pool is initialized
Can't locate Getopt/Long.pm in @INC (you may need to install the Getopt::Long module) (@INC contains: /etc/perl /usr/lib64/perl/site_perl/5.22.0/ /usr/lib64/perl/site_perl/5.22.0 /usr/lib64/perl/vendor_perl/5.22.0/ /usr/lib64/perl/vendor_perl/5.22.0 /usr/lib64/perl/5.22.0/ /usr/lib64/perl/5.22.0 /usr/local/lib/site_perl /usr/lib64/perl/5.22.0 .) at /usr/sbin/drbd-overview line 393.
BEGIN failed--compilation aborted at /usr/sbin/drbd-overview line 393. 

the patch explicaitly specified dependency for perl;s lib needed.