Add NHC timeout

Former-commit-id: 19987182

roles/nhc/templates/nhc.sysconfig.j2

-CONFDIR={{ nhc_dir }}/etc/nhc
+NFDIR={{ nhc_dir }}/etc/nhc
 NHC_RM=slurm
 HELPERDIR={{ nhc_dir }}/libexec/nhc
 PATH={{ slurm_dir }}/bin:{{ nhc_dir }}/sbin:$PATH
@@ -9,4 +9,6 @@ NHC_EMAIL_TO="{{ nhc_emails }}"
 NHC_EMAIL_SUBJECT="{{ nhc_email_subject }}"
 NHC_LOOP_TIME="300"
 DF_FLAGS="-Tk"
+# Timeout value added temporarily by Trung - 20200409
+TIMEOUT=150