Description of problem:
For example, the new samba-common-tools sub-package that indirectly depends on samba-common, will pull samba-common when it is installed, but then samba common can be erased without erasing any other samba sub-package. This can lead to situation when net join is not working.
The problem seems to be in this line is the spec file:
Requires(pre): %{name}-common = %{samba_depver}

Version-Release number of selected component (if applicable):
samba-4.2.3-7.el7

How reproducible:
always

Steps to Reproduce:

# rm -rf /var/lib/samba/ && yum erase -y `rpm -qa libsmb\* samba\*`
...snip

# yum install -y samba-common-tools
... snip

# rpm -ev samba-common
Preparing packages...
samba-common-0:4.2.3-7.el7.noarch
#
# echo password | /usr/bin/net -s realmd-smb-conf -U administrator ads join ad.domain.test; echo $?
Enter administrator's password:
Failed to open /var/lib/samba/private/secrets.tdb
Failed to join domain: Unable to open secrets database
255