build/ops: deb: add python dependencies where needed

The post-split daemon packages (ceph-mon, ceph-mds, ceph-osd, etc.) have
"ceph-base" as a dependency and ceph-base has "${python:Depends}" but this
macro only gets expanded for ceph-base.

As a result, the "ceph" CLI tool is broken when only "ceph-mon" is installed.

Fixes: http://tracker.ceph.com/issues/17579

Signed-off-by: Nathan Cutler <ncutler@suse.com>

debian/control

@@ -119,6 +119,7 @@ Package: ceph-mds
 Architecture: linux-any
 Depends: ceph-base (= ${binary:Version}),
          ${misc:Depends},
+         ${python:Depends},
          ${shlibs:Depends}
 Recommends: ceph-fuse (= ${binary:Version}),
             libcephfs1 (= ${binary:Version})
@@ -148,6 +149,7 @@ Package: ceph-mgr
 Architecture: linux-any
 Depends: ceph-base (= ${binary:Version}),
          ${misc:Depends},
+         ${python:Depends},
          ${shlibs:Depends}
 Replaces: ceph (<< 0.93-417)
 Breaks: ceph (<< 0.93-417)
@@ -176,6 +178,7 @@ Architecture: linux-any
 Depends: ceph-base (= ${binary:Version}),
          python-flask,
          ${misc:Depends},
+         ${python:Depends},
          ${shlibs:Depends}
 Recommends: ceph-common
 Replaces: ceph (<< 10)
@@ -606,6 +609,7 @@ Depends: ceph-common (= ${binary:Version}),
          mime-support,
          librgw2 (= ${binary:Version}),
          ${misc:Depends},
+         ${python:Depends},
          ${shlibs:Depends}
 Recommends: ntp | time-daemon
 Description: REST gateway for RADOS distributed object store