pcp updates: pmcd clients use "local:" as the default instead of gethostname() or localhost

[Dave Brolley <brolley@xxxxxxxxxx>]

The following changes have been committed to the brolley/dev branch in 
the pcpfans repository. They change the default connection for pmcd 
clients from gethostname() or localhost to "local:" which tries pmcd's 
unix domain socket, if supported, followed by localhost.
A final qa run is underway to catch any problems caused by the final 
commit (b2568...)
Dave

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commit b2568e97f649c0a05b1b985960714680d1266dec
Author: Dave Brolley <brolley@xxxxxxxxxx>
Date:   Tue Jul 30 16:01:45 2013 -0400

    Change default for pmcd client's using "localhost" to "local:".

commit 60239ce5c6d60c8b495dbdac3556b8b4eb7dfa82
Author: Dave Brolley <brolley@xxxxxxxxxx>
Date:   Tue Jul 30 15:31:15 2013 -0400

    qa fallout for change of default to "local:" for pmcd clients.

commit f9ff157f5e64c8d1bb7dbb9f0fe26b465f2066af
Author: Dave Brolley <brolley@xxxxxxxxxx>
Date:   Tue Jul 30 15:30:02 2013 -0400

    Revert default of "local:" for libpcp_trace/src/trace.c.

commit 48fb1d4fbbc7364ed5c0f48c1703b082dc6a92fd
Author: Dave Brolley <brolley@xxxxxxxxxx>
Date:   Tue Jul 30 15:29:00 2013 -0400

    Re-instate "local:" default for pmie.

    Sorry for the confusion.

commit 5e3612c42655f85807f6aef94e1ee87b47ffafeb
Author: Dave Brolley <brolley@xxxxxxxxxx>
Date:   Tue Jul 30 13:40:20 2013 -0400

    Revert use of "local://" as the default for pmie.

commit e7c2c4f259b2edfb7a249aea047d160df4709974
Merge: 7a7f8b7 50ae01f
Author: Dave Brolley <brolley@xxxxxxxxxx>
Date:   Tue Jul 30 11:53:45 2013 -0400

    Merge remote-tracking branch 'origin/dev' into brolley/dev

commit 7a7f8b764d65d6290aaa72831edf97a79c8933c5
Author: Dave Brolley <brolley@xxxxxxxxxx>
Date:   Tue Jul 30 11:51:16 2013 -0400

    Change pmcd clients to use "local://" by default instead of 
gethostname().