libvpd: Convert strcat to strncat
libvpd: Convert strcat to strncat

Using strncat instead of  strcat for security reasons.

Signed-off-by: Janani Venkataraman <f56d6e31cd704fb274698b50a2e47c9c06a451e9@linux.vnet.ibm.com>
Reviewed-by: Kamalesh Babulal <30b3129b1a1b0120e30fdc2f7d8e6560be5d0735@linux.vnet.ibm.com>
Signed-off-by: Vasant Hegde <a6d753843573f7bfed5075c1e875b0be8007a0ab@linux.vnet.ibm.com>

kamalesh-babulal/libvpd,kamalesh-babulal/libvpd,jananive/libvpd,jananive/libvpd,jananive/libvpd,kamalesh-babulal/libvpd