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Description of problem:

libguestfs upstream maintains a very strong commitment to backwards
compatibility.  We have never broken the C API, and (apart from
one notorious occasion with virt-inspector that happened a long
time ago) never break backwards compat for command line tools either.

Therefore it makes sense to rebase libguestfs in RHEL 7.6.

Version-Release number of selected component (if applicable):

Current upstream version of libguestfs -- at least 1.38.x

Verified with the package:
libguestfs-1.38.2-12.el7.x86_64

Automation test result: 
https://polarion.engineering.redhat.com/polarion/#/project/RedHatEnterpriseLinux7/testrun?id=libguestfs-1_38_2-12_el7%20RHEL-7_6-20180906_0%20x86_64%202018-09-09%2023-35-37
Manual test result:
https://polarion.engineering.redhat.com/polarion/#/project/RedHatEnterpriseLinux7/testrun?id=libguestfs-1_38_2-5_el7%20RHEL-7_6-20180626_0%20manual%20test%20run

Result: PASSED

For virt-v2v and virt-p2v,all functional testing and full matrix testing are finished,the result is PASS.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:3021