nscd is recommended package for libpam-ldapd and libnss-ldapd, but
since we disabled Install-Recommends for apt in
https://gerrit.mcp.mirantis.net/14431 we need to specify this package in
linux formula.
nscd is a daemon which handles passwd, group and host lookups for
running programs and caches the results for the next query.

Change-Id: Ia17441da2b3072d943d0e9225721dc9921de2514