Stop using host network to build containers since newer version of Docker fail without --allow.

Config/ProvisionTests/docker-compose.example.yml

@@ -16,7 +16,6 @@ services:
     build:
       context: ./
       dockerfile: Dockerfiles/arch
-      network: host
       args:
         PACKAGES: ${PACKAGES}
         EXTRA_ARCH: ${EXTRA_ARCH}
@@ -45,7 +44,6 @@ services:
     build:
       context: ./
       dockerfile: Dockerfiles/debian
-      network: host
       args:
         PACKAGES: ${PACKAGES}
         EXTRA_DEBIAN: ${EXTRA_DEBIAN}
@@ -74,7 +72,6 @@ services:
     build:
       context: ./
       dockerfile: Dockerfiles/fedora
-      network: host
       args:
         PACKAGES: ${PACKAGES}
         EXTRA_FEDORA: ${EXTRA_FEDORA}
@@ -103,7 +100,6 @@ services:
     build:
       context: ./
       dockerfile: Dockerfiles/opensuse
-      network: host
       args:
         PACKAGES: ${PACKAGES}
         EXTRA_OPENSUSE: ${EXTRA_OPENSUSE}
@@ -132,7 +128,6 @@ services:
     build:
       context: ./
       dockerfile: Dockerfiles/ubuntu
-      network: host
       args:
         PACKAGES: ${PACKAGES}
         EXTRA_UBUNTU: ${EXTRA_UBUNTU}