Current install_os_domU.sh depends on some keywords which are changed in the
next version XenServer which is upgraded to CentOS 7. So with the existing
script to install domU in the new version XenServer, it will always fail.
This patch is to make it to be compatible with all XenServer versions:
1. the output format of "ifconfig" is changed; the fix is to use the ip
command to retrieve IP address.
2. In XS 6.5 and the previous XS, the "xe-guest-utilities" package file name
is as "xe-guest-utilities_<version>_<arch>.deb" but now it delivers a
single file for all Arch's and the file name is
"xe-guest-utilities_<version>_all.deb". In order to make it to be
compatible, the fix will try to search the old file name pattern by
default. If it does't exist, then try to search the new file name pattern.
Change-Id: I893e89e42a5ef7dd079b571ea308f318c9befc9e
Closes-Bug: #1494241
78f6c1d70b