configure.ac,debian,rpm: do not package .a files in rpm/deb packages

configure.ac,debian,rpm: do not package .a files in rpm/deb packages

this change removes *.a from -dev or -devel packages.

* configure.ac:
  - use LT_INIT instead of AM_PROG_LIBTOOL. the later is deprecated.
  - disable static lib:
    .a static libraries not not useful, it's tricky to generate both
    static libraries and shared libraries in cmake.
    see http://www.spinics.net/lists/ceph-devel/msg30637.html
* ceph.spec.in: fedora packaging policy forbids this
  see
  https://fedoraproject.org/wiki/Packaging:Guidelines#Packaging_Static_Libraries
* debian/*-dev.install: debian does not requires this
  see
  https://www.debian.org/doc/debian-policy/ch-sharedlibs.html#s-sharedlibs-static

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