Modify the constraint to allow single quote for DPDK core list param
Modify the constraint to allow single quote for DPDK core list param

DPDK core list has to be give a string. For multiple cores, it
be given as "'1,2'". But the constraint does not allow ' (single
quote) to be set in the string. Modifying the constraint pattern.
Closes-Bug: #1633433

Depends-On: I01bf15b3c689b4fd0cdd848cf264dd9794e1d828
Change-Id: Ide2194d9ef5c10e276fa1a634919dfb286e483d6
(cherry picked from commit 1884d2a01c3fae195439918df2a1ea3f201b8893)

trozet/opnfv-tht,trozet/opnfv-tht,trozet/opnfv-tht