Fixed issue with sdp_upgrade.sh where extraction of values with a '=' in the
value were not extracted correctly. For example, the p4_N.vars file could
contain a value like so:
export PROXY_V_FLAGS="-v net.autotune=1"
This was parsed with: cut -d '=' -f 2, returning incomplete text:
-v net.autotune (sans the "=1" on the right side).
The fix was done by changing, in some places:
cut -d '=' -f 2
with a more robust expression:
perl -pe 's|^.*?=||g'
In some cases where the value to the right of the '=' was reliably simple, e.g.
for something like SDP_INSTANCE_VARS_FORMAT=1.5, the simpler 'cut' expression
was left in place. The perl expression is used in places where the right-side
of the assignment could possibly be a more complex value, possibly including
an '=' sign.
Note: sed was explored, but Perl was ultimately selected as the 'sed' regular
expressions, even extended ones with '-E', do not support lazy regex macthing,
as needed for this expression.