MT#61568 debian: Switch to Rules-Requires-Root no

This field tells dpkg-buildpackage that no debian/rules target needs
to run as root-like (usually via fakeroot), and can be built with no
privileges (real or faked ones). This should make the build either
faster as there will be no interposed libc calls via an LD_PRELOAD
library like fakeroot does, and more robust as fakeroot needs to keep
up with implementation details from the system libc; or more secure if
the build was being done via real root.

The full documentation can be found with «man deb-src-control» and
at «/usr/share/doc/dpkg/spec/rootless-builds.txt».

Some test cases in the test suite require execution under root-like,
and if not will fallback to use `fakeroot`. Once we stop running the
build as root-like (via fakeroot), the test then tries to execute
fakeroot which cannot be found any longer as there is no explicit
Build-Depends on it, so we need to add it explicitly.

After the above, there is no longer any need to run the build as
root-like. A rebuild before and after this change produces the same
file list and permissions.

Change-Id: I639a3c77dc0a74430813377124eedf197589121a

debian/control

@@ -4,11 +4,12 @@ Priority: optional
 Maintainer: Sipwise Development Team <support@sipwise.com>
 Homepage: https://www.sipwise.com/
 Standards-Version: 4.6.2
-Rules-Requires-Root: binary-targets
+Rules-Requires-Root: no
 Build-Depends:
  asciidoctor,
  bash-completion (>= 1:2.1-4.2~),
  debhelper-compat (= 13),
+ fakeroot,
  git,
  libcapture-tiny-perl,
  libclone-perl,