Fine-tunes securedrop-config package dependency

Previously tried to piggyback on securedrop-keyring, setting the
securedrop-config package as a dependency thereof. It's more explicit to
list securedrop-config as a dependency of packages required for the
Application and Monitor Server roles:

  * securedrop-app-code
  * securedrop-ossec-agent
  * securedrop-ossec-server

Therefore, removed the dependency in securedrop-keyring.

install_files/securedrop-app-code/DEBIAN/control

@@ -6,5 +6,5 @@ Homepage: https://securedrop.org
 Package: securedrop-app-code
 Version: 0.4.3
 Architecture: amd64
-Depends: python-pip,apparmor-utils,gnupg2,haveged,python,python-pip,secure-delete,sqlite,apache2-mpm-worker,libapache2-mod-wsgi,libapache2-mod-xsendfile,redis-server,supervisor,securedrop-keyring
+Depends: python-pip,apparmor-utils,gnupg2,haveged,python,python-pip,secure-delete,sqlite,apache2-mpm-worker,libapache2-mod-wsgi,libapache2-mod-xsendfile,redis-server,supervisor,securedrop-keyring,securedrop-config
 Description: Packages the SecureDrop application code pip dependencies and apparmor profiles. This package will put the apparmor profiles in enforce mode. This package does use pip to install the pip wheelhouse

install_files/securedrop-keyring/DEBIAN/control

@@ -6,5 +6,5 @@ Homepage: https://securedrop.org
 Package: securedrop-keyring
 Version: 0.1.0+0.4.3
 Architecture: amd64
-Depends: gnupg,securedrop-config
+Depends: gnupg
 Description: Provides an apt keyring for SecureDrop-related packages, so the master signing key used for SecureDrop packages can be updated via apt.

install_files/securedrop-ossec-agent/DEBIAN/control

@@ -6,7 +6,7 @@ Homepage: https://securedrop.org
 Package: securedrop-ossec-agent
 Version: 2.8.2+0.4.3
 Architecture: amd64
-Depends: ossec-agent,securedrop-keyring
+Depends: ossec-agent,securedrop-keyring,securedrop-config
 Replaces: ossec-agent
 Conflicts: securedrop-ossec-server
 Description: Installs the securedrop pre-configured OSSEC agent

install_files/securedrop-ossec-server/DEBIAN/control

@@ -6,7 +6,7 @@ Homepage: https://securedrop.org
 Package: securedrop-ossec-server
 Version: 2.8.2+0.4.3
 Architecture: amd64
-Depends: ossec-server,securedrop-keyring
+Depends: ossec-server,securedrop-keyring,securedrop-config
 Replaces: ossec-server
 Conflicts: securedrop-ossec-agent
 Description: Installs the pre-packaged OSSEC server