pcp udpates: coverity errors (brolley), pmdadocker cleanup

Changes committed to git://git.pcp.io/pcp/pcp.git master

Dave Brolley (5):
      Fix buffer overruns found by Coverity.
      Fix bad usage of free(3) found by coverity.
      Remove uninitialized/unused variable found by Coverity.
      Fix potential buffer overflows detected by Coverity.
      Fix dead code discovered by Coverity.

Lukas Berk (1):
      pmdadocker: Remove unused buildversion artifacts

 src/libpcp_web/src/http_client.c  |    7 +++----
 src/libpcp_web/src/json_helpers.c |    3 ++-
 src/pmdas/docker/docker.c         |    5 ++---
 src/pmdas/linux/ipc.c             |    7 -------
 src/pmdas/linux/proc_buddyinfo.c  |   10 +++++++---
 src/pmdas/linux/sysfs_tapestats.c |    2 +-
 src/pmdas/mmv/src/mmv.c           |    2 --
 7 files changed, 15 insertions(+), 21 deletions(-)

Details ...

commit ef0bbdcf38176d5d4d90102f81b0ad5d4cfaeab0
Author: Lukas Berk <[email protected]>
Date:   Thu Feb 23 15:24:35 2017 -0500

    pmdadocker: Remove unused buildversion artifacts
    
    While the json definition and the case statement in the fetchcallback
    were present.  This metric wasn't actually used.

commit e27059eb1225abc18d16563414b81c72f16d4af3
Author: Dave Brolley <[email protected]>
Date:   Tue Feb 21 15:06:52 2017 -0500

    Fix dead code discovered by Coverity.

commit 490e799d184f46983515ea49457971761e6a9065
Author: Dave Brolley <[email protected]>
Date:   Tue Feb 21 14:33:13 2017 -0500

    Fix potential buffer overflows detected by Coverity.

commit 5de53e9b63f58ff715e895b68a0fa358df5c19c4
Author: Dave Brolley <[email protected]>
Date:   Tue Feb 21 14:03:49 2017 -0500

    Remove uninitialized/unused variable found by Coverity.

commit 2eabd0c643a0049c7670f5bd5407d6dbefb988d2
Author: Dave Brolley <[email protected]>
Date:   Tue Feb 21 12:46:48 2017 -0500

    Fix bad usage of free(3) found by coverity.

commit 15ba61be6e7a3a3f25126bd14c1db5110441278f
Author: Dave Brolley <[email protected]>
Date:   Tue Feb 21 12:06:30 2017 -0500

    Fix buffer overruns found by Coverity.

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