gnu: Move content of openssl module into tls module.

* gnu/packages/openssl.scm (openssl, perl-net-ssleay): Move to...
* gnu/packages/tls.scm: ...here.
* gnu/packages/openssl.scm: Delete file.
* gnu-system.am (GNU_SYSTEM_MODULES): Unregister deleted file.
* gnu/packages/{admin.scm, bittorrent.scm, certs.scm, ci.scm,
  cyrus-sasl.scm, databases.scm, dns.scm, ebook.scm, enlightenment.scm,
  gnunet.scm, libreoffice.scm, links.scm, mail.scm, messaging.scm,
  networking.scm, ntp.scm, openldap.scm, package-management.scm, pdf.scm,
  python.scm, qt.scm, rdesktop.scm, rdf.scm, ruby.scm, ssh.scm,
  synergy.scm, tor.scm, version-control.scm, video.scm, vpn.scm,
  w3m.scm, web.scm, weechat.scm, xiph.scm}: Adapt module import.

gnu/packages/admin.scm

@@ -40,7 +40,6 @@
   #:use-module (gnu packages perl)
   #:use-module (gnu packages tcl)
   #:use-module (gnu packages compression)
-  #:use-module ((gnu packages openssl) #:prefix o:)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages gnupg)
   #:use-module (gnu packages bison)
@@ -501,7 +500,7 @@ network statistics collection, security monitoring, network debugging, etc.")
                 "15hb7zkzd66nag102qbv100hcnf7frglbkylmr8adwr8f5jkkaql"))))
     (build-system gnu-build-system)
     (inputs `(("libpcap" ,libpcap)
-              ("openssl" ,o:openssl)))
+              ("openssl" ,openssl)))
     (native-inputs `(("perl" ,perl)))        ; for tests
     (home-page "http://www.tcpdump.org/")
     (synopsis "Network packet analyzer")
@@ -975,7 +974,7 @@ characters can be replaced as well, as can UTF-8 characters.")
     (inputs
      `(;; ("ntfs" ,ntfs)
        ("util-linux" ,util-linux)
-       ("openssl" ,o:openssl)
+       ("openssl" ,openssl)
        ("zlib" ,zlib)
        ("e2fsprogs" ,e2fsprogs)
        ("libjpeg" ,libjpeg)