Modified mkovf error messages
Modified mkovf error messages

Some error messages concatenated strings with objects of other types,
added built-in str function as fix.

Modified raise call for errors such that error message was enclosed in
parenthesis to match recommended convention.

Signed-off-by: Eric Casler <b60e0c7f587bb03c4b0cd762bfb7425c34536ff1@us.ibm.com>
[smoser@linux.vnet.ibm.com:removed mod to raiseException -- had been removed]
Signed-off-by: Scott Moser <f411aed5b71f5ab75e7f202cdde1f0f4410975aa@linux.vnet.ibm.com>

Awingu/open-ovf,Awingu/open-ovf,Awingu/open-ovf,Awingu/open-ovf