Ceph version issue in ubuntu

In the master branch, the version of ceph is luminous, but in the ubuntu image that is built, the version of ceph is mimic.

```
(ceph-mon)[root@dev-ceph001-ncl /]# ceph version
ceph version 13.2.1 (5533ecdc0fda920179d7ad84e0aa65a127b20d77) mimic (stable)
```

The root cause is that the latest ceph version in the apt source is the mimic version.

```
(ceph-mon)[root@dev-ceph001-ncl /]# apt-cache showpkg ceph
Package: ceph
Versions:
13.2.1+dfsg1-0ubuntu2~cloud0 (/var/lib/apt/lists/ubuntu-cloud.archive.canonical.com_ubuntu_dists_bionic-updates_rocky_main_binary-amd64_Packages.lz4) (/var/lib/dpkg/status)
 Description Language:
                 File: /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_bionic_main_binary-amd64_Packages.lz4
                  MD5: 744df4d020b57452ac4638e56eff9c7b
 Description Language:
                 File: /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_bionic-updates_main_binary-amd64_Packages.lz4
                  MD5: 744df4d020b57452ac4638e56eff9c7b
 Description Language:
                 File: /var/lib/apt/lists/ubuntu-cloud.archive.canonical.com_ubuntu_dists_bionic-updates_rocky_main_binary-amd64_Packages.lz4
                  MD5: 744df4d020b57452ac4638e56eff9c7b

12.2.4-0ubuntu1.1 (/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_bionic-updates_main_binary-amd64_Packages.lz4)
 Description Language:
                 File: /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_bionic_main_binary-amd64_Packages.lz4
                  MD5: 744df4d020b57452ac4638e56eff9c7b
 Description Language:
                 File: /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_bionic-updates_main_binary-amd64_Packages.lz4
                  MD5: 744df4d020b57452ac4638e56eff9c7b
 Description Language:
                 File: /var/lib/apt/lists/ubuntu-cloud.archive.canonical.com_ubuntu_dists_bionic-updates_rocky_main_binary-amd64_Packages.lz4
                  MD5: 744df4d020b57452ac4638e56eff9c7b

12.2.4-0ubuntu1 (/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_bionic_main_binary-amd64_Packages.lz4)
 Description Language:
                 File: /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_bionic_main_binary-amd64_Packages.lz4
                  MD5: 744df4d020b57452ac4638e56eff9c7b
 Description Language:
                 File: /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_bionic-updates_main_binary-amd64_Packages.lz4
                  MD5: 744df4d020b57452ac4638e56eff9c7b
 Description Language:
                 File: /var/lib/apt/lists/ubuntu-cloud.archive.canonical.com_ubuntu_dists_bionic-updates_rocky_main_binary-amd64_Packages.lz4
                  MD5: 744df4d020b57452ac4638e56eff9c7b
```

So to install the luminous version we need to specify the version of all related packages of ceph.

```
apt-get install ceph=12.2.4-0ubuntu1 ceph-mgr=12.2.4-0ubuntu1 ceph-mon=12.2.4-0ubuntu1 ceph-osd=12.2.4-0ubuntu1 ceph-base=12.2.4-0ubuntu1 ceph-common=12.2.4-0ubuntu1 librbd1=12.2.4-0ubuntu1 python-cephfs=12.2.4-0ubuntu1 python-rados=12.2.4-0ubuntu1 python-rbd=12.2.4-0ubuntu1 libcephfs2=12.2.4-0ubuntu1 librados2=12.2.4-0ubuntu1 libradosstriper1=12.2.4-0ubuntu1 radosgw=12.2.4-0ubuntu1 librgw2=12.2.4-0ubuntu1
```