Merge pull request #1353 in SNORT/snort3 from alpine to master

Merge pull request #1353 in SNORT/snort3 from alpine to master

Squashed commit of the following:

commit 8bfe2663676b663fb4dad6788e8663e825f56f65
Author: Michael Altizer <mialtize@cisco.com>
Date:   Tue Sep 4 21:25:45 2018 -0400

    build: Add libnsl and libsocket to Snort for Solaris builds

    Fixes Snort build on OpenIndiana.

commit 42dccb76a6c0d504118e2c71a68aa71070b09b9c
Author: Michael Altizer <mialtize@cisco.com>
Date:   Tue Sep 4 18:30:54 2018 -0400

    build: Fall back on TI-RPC if no built-in RPC DB is found

    Necessary for getrpcent() on musl-based Linux systems.

commit c70cd8e45e2227c2937d350ad05d82c39f05350c
Author: Michael Altizer <mialtize@cisco.com>
Date:   Tue Sep 4 19:07:14 2018 -0400

    daqs: Include unistd.h directly for better cross-platform compatibility

commit cb2df1c310054404c80339ff2b4de072ba1ed551
Author: Michael Altizer <mialtize@cisco.com>
Date:   Tue Sep 4 15:32:45 2018 -0400

    build: Introduce a more robust check for GNU strerror_r

    This should better handle the case where we're using alternative C
    libraries on Linux like musl.