rpm,deb: remove btrfs-tools as a build-dependency

this change reverts 7d48d21a

we are using bluestore for testing by default on GNU/Linux now. and on
FreeBSD, install-deps.sh does not look at spec.in or d/control.

Signed-off-by: Kefu Chai <kchai@redhat.com>

ceph.spec.in

@@ -219,7 +219,6 @@ BuildRequires:	systemd
 PreReq:		%fillup_prereq
 BuildRequires:	net-tools
 BuildRequires:	libbz2-devel
-BuildRequires:  btrfsprogs
 BuildRequires:	mozilla-nss-devel
 BuildRequires:	keyutils-devel
 BuildRequires:  libopenssl-devel
@@ -238,7 +237,6 @@ BuildRequires:	liblz4-devel >= 1.7
 %if 0%{?fedora} || 0%{?rhel}
 Requires:	systemd
 BuildRequires:  boost-random
-BuildRequires:	btrfs-progs
 BuildRequires:	nss-devel
 BuildRequires:	keyutils-libs-devel
 BuildRequires:	libibverbs-devel

debian/control

@@ -7,8 +7,7 @@ Vcs-Browser: https://github.com/ceph/ceph
 Maintainer: Ceph Maintainers <ceph-maintainers@lists.ceph.com>
 Uploaders: Ken Dreyer <kdreyer@redhat.com>,
            Alfredo Deza <adeza@redhat.com>,
-Build-Depends: btrfs-tools,
-               cmake (>= 3.5),
+Build-Depends: cmake (>= 3.5),
                cpio,
                cryptsetup-bin | cryptsetup,
                cython,