prov/lpp: Address coverity scan issues

[tstruk]

Address coverity scan issues in LPP and lpp_regression fabtest.

[j-xiong]

sever_running is set to 1 before the thread is created and never set to 0. What's the difference from the old code?

[tstruk]

This is just to stop the coverity complaining about dead code after the while loop.

[a-szegel]

bot:aws:retest

[j-xiong]

bot:aws:retest

[a-szegel]

AWS CI failed to compile with:

ERROR    root:utils.py:94 Command make -j failed with error:

prov/lpp/src/main.c:140:32: error: initializer element is not constant

 static const int total_tests = ((num_tests + num_cuda_tests + num_rocm_tests));

                                ^

make[1]: *** [prov/lpp/src/main.o] Error 1

make[1]: *** Waiting for unfinished jobs....

prov/lpp/src/test_util.c: In function ‘util_init’:

prov/lpp/src/test_util.c:135:13: warning: 'FI_MR_BASIC' is deprecated

  hints.domain_attr->mr_mode = FI_MR_BASIC;

             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

make: *** [all] Error 2