ceph-deploy.spec: quote RPM macros in comments

ceph-deploy.spec: quote RPM macros in comments

Prior to this commit, RPM would expand the macros that were present in
the comment.

Use a double percent sign to quote the macros so that RPM will not expand
them.

This fixes the following rpmlint warnings:

  ceph-deploy.spec:60: W: macro-in-comment %setup
  ceph-deploy.spec:60: W: macro-in-comment %{name}

More information from rpmlint's "-I" (help) command:

  $ rpmlint -I macro-in-comment
  macro-in-comment:
  There is a unescaped macro after a shell style comment in the
  specfile.  Macros are expanded everywhere, so check if it can cause a
  problem in this case and escape the macro with another leading % if
  appropriate.

Signed-off-by: Ken Dreyer <kdreyer@redhat.com>