On CentOS 6, system account ids were bellow 500.
This changes on CentOS 7, range reserved for
system account is now 0-999. This may cause troubles for the
migration. In addition, range 0-199 is prohibited to use without
static id reservation in setup package. Id's in this range might
be reserved and used later by some package, thus using them may cause
malfunction of such package.

Following problems were found on your system:

 User "jboss" uses id 500 - this is in the range of system accounts.
 User "osc" uses id 502 - this is in the range of system accounts.
 User "hhivaas" uses id 601 - this is in the range of system accounts.
 User "jerryj" uses id 602 - this is in the range of system accounts.
 User "kapil" uses id 603 - this is in the range of system accounts.
 User "scpark" uses id 604 - this is in the range of system accounts.
 User "mwchoi" uses id 777 - this is in the range of system accounts.
 User "watchapm" uses id 700 - this is in the range of system accounts.

 group "mwa" uses id 500 - this is in the range of system accounts.
 group "jboss" uses id 501 - this is in the range of system accounts.
 group "osc" uses id 502 - this is in the range of system accounts.
 group "hhivaas" uses id 601 - this is in the range of system accounts.
 group "jerryj" uses id 602 - this is in the range of system accounts.
 group "kapil" uses id 603 - this is in the range of system accounts.
 group "scpark" uses id 604 - this is in the range of system accounts.
 group "mwchoi" uses id 777 - this is in the range of system accounts.


These accounts should be migrated into the "safe" zone above 1000!
As an alternative, you can change the default ranges in /etc/login.defs to
the old CentOS 6 values if you require this by your system setup settings.